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Autobody Technician Year 1 > Second Week Exam > Flashcards

Second Week Exam Flashcards

1
Q

Conventional spray guns are poor because the transfer efficiency is only __% to __% .

The transfer efficency of a HVLP set to __psi at the nozzle is at least __% to __%

A

25 to 35

65 to 90

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2
Q

What is the most common type of media used for sandblasting?

A

Silica sand

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3
Q

A ___ grade of steel wool can be used on chrome and glass

A

000

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4
Q

When sandblasting the distance should be approx _” to __” and the angle should be __ to __ degrees

A

8” to 12”

20

30

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5
Q

Heavy bodied seam sealers are used to fill seams from _/_” to _/_”

A

1/8

1/4

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6
Q

1 hp = _ cfm

A

4 cfm

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7
Q

Wax oil should not be sprayed until?

A

all resfinishing procedures have been done

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8
Q

Manufacturers reccomend using no coarser than __ grit for abrading the metal fill area

A

36

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9
Q

When finding the year of the vehicle which digit of the VIN number is refered to?

A

10th

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10
Q

The term ________ refers to any product used to prepare a vehicle surface for colour coats of paint.

A

undercoat

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11
Q

Steel is a _______ metal, which means that it contains iron and is therefore magnetic.

A

ferrous

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12
Q

Sanding paste and _______ ________ are used in surface preperation where a fine scratch is needed for adhesion purposes.

A

rubbing compound

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13
Q

Where would short strand fiberglass filler be used?

A

Welds or extensive metal repair

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14
Q

Fillers cure by ________ reaction.

A

Exothermic

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15
Q

Composite repair material is usually a two-part material (resin and catalyst) that comes in _________ that fit into a specially designed applicator gun.

A

cartridges

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16
Q

Use fillers to repair ______ imperfections no more than _/_” deep

A

minor

1/8”

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17
Q

Urethane composite repair material is designed for _______.

A

mending

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18
Q

Coated or galvanized steel is bare steel that has a ____ coating on one or both sides and acts as a non-ferrous material.

A

zinc

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19
Q

The two types of tests you can conduct to figure out what kind of plastic your working with are

A

grind test

float test

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20
Q

Banding is done using a verticle gun stroke at each end of the panel, and is made with a small spray fan of about _”

A

4”

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21
Q

The average HVLP gun requires an air compressor capable of producing between __ and __ cubic feet of air.

A

15 to 25

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22
Q

What is a Cyanoacrylate?

A

Crazy glue

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23
Q

Wet sandpaper uses _______ carbide mineral particles on grits above 1000 and ______ oxide particles on grits 220-800.

A

Silicon

Aluminum

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24
Q

Hold you block at a __° angle

A

30

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25
Q

Remember if its a ______, use a promoter.

A

floater

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26
Q

HVLP guns are designed to operate at __ psi to __ psi

A

12 to 43

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27
Q

Body filler used mechanical adhesion to stick, or ____.

A

bite

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28
Q

_______ is defined as the ability of a liquid to resist flow.

A

Viscosity

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29
Q

Sanding materials for a blend include _____ ___, sanding paste, _______ ________ and sandpaper

A

scuff pads

rubbing compound

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30
Q

Chip-resistant coatings come in two different types which are?

A

Spray-on

Clear adhesive plastic (3m)

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31
Q

You should always back sand _” to __” farther out from where the primer is to be sprayed.

A

8” to 12”

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32
Q

Undercatalyzation is caused by not using enough ______.

A

Hardener

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33
Q

__________ need a special adhesion promoter to help the repair material bond properly.

A

Thermoplastics

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34
Q

Guide coats come as either _____ or ___ _______.

A

aerosol

dry powder

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35
Q

Brushable seam sealer is a heavy-bodied sealant that is applied with a stiff-bristled _____ on seams where appearance is not important.

A

brush

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36
Q

Make sure the vehicle is at __°c before applying filler.

A

21

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37
Q

1 mil equals _/____”

A

1/1000”

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38
Q

Incorrectly repairing surface preperation or applying filler more than _/_” may cause the filler to crack.

A

1/8”

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39
Q

What are microbeads?

A

They are hollow glass bubbles in lightweight body filler. They come in many different sizes and densitys.

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40
Q

Chalking is used to describe an old finish that has ________ over time.

A

deteriorated

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41
Q

Most faults in body filler are caused by ____ _____.

A

Human Error

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42
Q
A
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43
Q

For catalyzed products, you need a minimum temperature of __°F (__°C) in order for the isocyanates to react and cure the product

A

60

15

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44
Q

Paint cracking is a series of deep _____ ressembling mud cracks in a dry pond.

A

cracks

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45
Q

Do not blob body filler on all at once. This causes poor ______ and traps air, which causes ________ and cracking.

A

adhesion

pinholes

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46
Q

Methyl ethyl ketone peroxide is a clear liquid hardener used with?

A

Liquid fiberglass resins

metal fillers

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47
Q

Plastic bead blasting is great for removing rust

True or False

A

False

Plastic bead blasting does not remove rust

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48
Q

Dry sandpaper is usually classified as an open coat type of paper, which means that the _______ oxide particles are placed apart from each other to permit sanded materials to flow out of the sandpaper

A

Aluminum

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49
Q

Always use ___-______ cleaning tools for your spray guns

A

non-metallic

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50
Q

Ultraviolet primers cure in _ to _ minutes

A

1 to 2

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51
Q

Apply stripper to one section at a time, up to _ feet square.

A

3 feet

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52
Q

When mixing products weight is expressed in ___.

A

grams

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53
Q

The two types of steel are ___-_____ and _______

A

non-coated

coated

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54
Q

A general rule for featheredging is that each layer of paint should be tapered approx _” between coats

A

1”

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55
Q

It is necessary to follow paint manufacturer recommendations for preparing a substrate for undercoat or topcoat application.

True or False

A

True

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56
Q

The second step to cleaning a substrate before sanding is a _____ wash

A

solvent

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57
Q

Long strand filler is the same as short strand but the fibers are _” to _” long.

A

1” to 3”

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58
Q

The grinder wheel should be held so that the back of the disk is raised __° off the metal.

A

20

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59
Q

Sheet-moulded compound (SMC) is a fiberglass-reinforced compound in sheet form. It is made by mixing chopped glass mat, resin, filler and catalyst together by placing it between two sheets of __________ film

A

polyethylene

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60
Q

The best way to remove paint is to use __ to __ grit sanding disk with an 8” foam back pad on an air wheel.

A

40

80

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61
Q

Name the 2 different ways to test for adhesion on a substrate

A

tape test

sand test

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62
Q

Leaving water on a substrate could leave behind ______ that can contaminate the cleaned sustrate.

A

deposits

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63
Q

Flexible polyester putty can be applied to plastic repairs to fill ______ and minor imperfections.

A

pinholes

64
Q

Name 2 purposes for talc in bodyfiller

A

Provide sandibility

Thicken

Add body

Structural strength

65
Q

Is the application of water-borne primer surfacer on flexible parts recommended?

A

No because elastomeric additives will not mix with water-borne products.

66
Q

Dry sandpaper uses a ___ stearate solution in its finer grades to keep the sandpaper from loading up

A

zinc

67
Q

What is the primary advantage of a microbead?

A

Sandability

68
Q

Prior to sanding any substrate you should always clean with warm, _____ _____

A

soapy water

69
Q

(TDS) _____ _____ ______ or (PDS) _____ ______ _______ are the information manuals for using any of your repair materials.

A

Technical Data Sheets

Product Data Sheets

70
Q

Overcatalyzation results when too much ______ is used.

A

hardener

71
Q

Damaged or broken (FRP) fibre reinforced plastics should be covered to prevent _______ of the water and detergents into cracked, damaged or broken areas

A

wicking

72
Q

Aluminum is a non-ferrous metal that is ___-______.

A

non-magnetic

73
Q

There are a few paint tests that you can conduct to determine the type of finish with which you will be working. Name them.

A

solvent test

sand test

74
Q

A minimum of a _ horsepower air compressor is required to run a HVLP gun

A

5

75
Q

For a cosmetic repair on SMC, sand the area with __ grit sandpaper to remove any paint within _” of the repair, then bevel the area with a die or angle grinder to provide adequte area for bonding.

A

80

3”

76
Q

what abrasive is used in sanding paste?

A

pumice

77
Q

____ ___ is the time required for solvent to evaporate before another coat of product can be applied.

A

Flash time

78
Q

Methyl Ethyl Ketone Peroxide (MEKP) is a severe skin irritant that can cause ______ and ______ disorders.

A

Blindness

Respiratory

79
Q

Peeling is caused by loss of ______ between any refinishing products such as primer, primer surfacer, sealer and topcoat.

A

adhesion

80
Q

What is polyester putty/ 2k putty can be finished using ___-___grit. 2k putty is designed for use as a skin coat over body filler to fill _______, deep scratches, low areas or other minor imperfections no deeper than _/__”

A

280-240

pinholes

1/32”

81
Q

Guide coats allow you to see imperfections such as sand scratches, ______, orange peel and sharp dents that you would not be able to see by looking at undercoat alone.

A

pinholes

82
Q

The most common composites are

A

plastic

fibre-reinforced plastic (FRP)

83
Q

The thinner or less visious the material, or the lower the amount of solids in the product, the ____ the sanding needs to be.

A

finer

84
Q

_________ is a process in which the sandpaper pad of the DA sander is placed on the the broken paint edge of a substrate and moved back and forth along the edge until the subsrate has been gradually tapered or a smooth edge acheived.

A

Featheredging

85
Q

When doing a plastic repair the bevel should be approx __° and bevelled back _/_” to _/_” to create a better surface area for adhesion

A

30

1/4

3/8

86
Q

Paint is measured in ____

A

mils

87
Q

Name the 2 types of talc used in fillers

A

Platelet talc

Round Talc

88
Q

Name a few composite repair materials.

A

rigid plastic repair

flexible plastic repir

ridgid SMC fiberglass repair

89
Q

Name 3 things Benzoyl Peroxide hardener (colored) is used in.

A

Lightweight body fillers

Short strand filler

Long strand filler

Flexible polyester putty

Soe SMC and fiberglass compatible resins

90
Q

The best way to repair a pinhole is to use a 1/8” ____ ___ or the corner of a razor blade to carve out the hole.

A

drill bit

91
Q

Blistering appears as small, _____
areas on the surface that ressemble water blisters on human skin.

A

swelled

92
Q

_____ are the first stage in any undercoating process

A

primers

93
Q

Name one result caused by undersanding

A

shiny spots

incomplete surface sanding or levelling

unsanded edges

94
Q

On the first application of filler hold the spreader at __° angle in the direction of pull.

A

60

95
Q

Substrate is defined as an _______ layer.

A

underlying

96
Q

_______ is used to remove paint and clean bare metal with little overlap of sanding marks.

A

Buffing

97
Q

Epoxy-based composite repair material has good _____ qualities for ______ repairs.

A

filling

cosmetic

98
Q

What does marbleize mean?

A

If the filler and hardener are not mixed to a uniform color, soft spots will form in the cured filler.

99
Q

A ____ ___ is created by featheredging bodywork, chips, and scatches improperly.

A

bulls eye

100
Q

Aluminum body and frame panels are usually _._ to _ times thicker than steel parts

A

1.5

2

101
Q

Typically, if there is 100 parts body filler there should be _ parts hardener.

A

2

102
Q

Name 1 thing a solvent wash does

A

dissolve the contamination

float the contaminants to the surface

suspend the contamination in the liquid solution

103
Q

What is long strand fiberglass filler used for?

A

It is used for final-shaping fibergalass panels ater the resin and matting have been laid.

104
Q

Spray-on chip-resistant coating, also known as ___ _____

A

rock gaurd

105
Q

What is deflection?

A

When metal dents, an area around the impact is drawn toward the damage causing a bigger dent than it looks like.

106
Q

What is a sureform file used for?

A

To cut through the resin and excess filler to contour quickly.

107
Q

When sanding anything you want to stay within a __ grit jump.

A

100

108
Q

The painted area should be removed with the sanding disk for _” to _” around the area to be filled.

A

3”

4”

109
Q

Fibre-reinforced plastic (FRP) is a composite material made up of a _____ or combination of ____ and reinforced with _____.

A

polymer

resins

fibers

110
Q

The abrasive travels through one hose while high velocity air of 50 psi to 80 psi and up to 150 psi travels through another.

What type of sandblaster is this?

A

Pressure blaster

111
Q

Hybrid plastics are defined in two categories, which are

A

thermoplastic

thermoset

112
Q

Short strand filler has resins and short lengths under _” of chopped _______ filler

A

1”

Fiberglass

113
Q

Always refer to the product manufactures ____ ____ for final grit recommendations.

A

data sheets

114
Q

Name 2 things a chemical stripper should not be used on

A

plastic parts

anodized aluminum

FRP panels

Flexible parts

Rubber trim

Upholstery

Plexiglass

115
Q

Body filler is a paste composed of polyester resin blended with ____ and ________ fillers.

A

Talc

Microbead

116
Q

Name the 2 types of resin that can be used to perform composite repairs.

A

Urethane

Epoxy

117
Q

Microchecking is the beginning of ____ breakdown and could be an indication that film failures such as cracking or crazing will develop.

A

film

118
Q

The spray gun is a precision engineered and maufactured instrument that _______ materials with compressed air and allows the material to be transferred to the surface being primed.

A

atomizes

119
Q

One way to check a spray pattern is with the ______ test method .

A

flood or static

120
Q

(OEM) and most aftermarket manufactures now coat their body components with ____ deposition primer (EDP)

A

Electro

121
Q

Air lines with an inside diameter of _/_” is recommended for an HVLP gun.

A

3/8”

122
Q

Standard __ and _____ removers used for metal substrates are highly flammable and should not be used on composites.

A

wax and grease

123
Q

When preparing a gouge or scratch on plastics, start with __ to __ grit Roloc disk on an angle grinder or a die grinder, and then _____ out the scratch.

A

36

50

bevel

124
Q
A
125
Q

Metal etching primers are sometimes called _______ primers.

A

straight

126
Q

Metal filler is resin based with actual ______ particles.

A

aluminum

127
Q

A typical OEM BC/CC finish is _ mils to _._ mils

A

5

7.5

128
Q

Is Methyl Ethyl Ketone Peroxide considered a carcinogen? Yes or No

A

Yes

129
Q

The recommended time to leave a solvent on a substrate is __ seconds to ______ minutes.

A

15

several

130
Q

Name the one main charcterisic of primer surfacer

A

sandable

131
Q

A rule of thumb is to hold the gun _” to _” away when spraying an HVLP gun

A

6 to 8”

132
Q

As a general rule, for each golfball sized glob of filler, use _” bead of hardener

A

1”

133
Q

In the fill area manufacturers recommend a __ to __ grit grinding disk, using a _____-___ pattern to prepare the area

A

36

50

134
Q

When chemical stripping, and moldings and name plates cannot be removed, they should be covered adequately with tape extending _” beyond the edge of the nameplate

A

1”

135
Q

When banding, keep the spray gun _” to _” closer than the normal distance to the panel.

A

1” to 2”

136
Q

Grit selections for circular sanders usually range from __ grit to ___ grit

A

36 to 100

137
Q

The hardener must be mixed before use, this is known as _______.

A

kneading

138
Q

What is metal filler used for?

A

aluminum repairs

139
Q

Flex additives are also called ________ additive

A

elastomeric

140
Q

Scuff sanding is used to remove all the small imperfections such as ____, dirt, ____ _____ and other minor imperfections from the surface.

A

lint

orange peel

141
Q

___ ____ is the time required for the solvent to completly evaporate from a product

A

Dry time

142
Q

Fiber reinforced plastics should be sanded ____ only.

A

dry

143
Q

Do not use _____, as the styrene in the filler will loosen any chemicals or wax in the _______ and cause it to break down and contaminate the filler. Any liquid from the filler or hardener will also be absorbed by the ________.

A

Cardboard

144
Q

All body fillers are _________ resin based (plastic)

A

thermoset

145
Q

Its okay to grind areas that will not be covered by filler.

True or False

A

False

Do not grind areas the will not be covered by filler.

146
Q

Name 2 charcteristics of aluminum oxide

A

reddish brown

extremly tough and durable

able to resit fracturing and dulling on harder finishes

popular in coarse grits for grinding metal, stripping old paint and shaping body filler

used in paper and disk form

preffered to use with todays BC/CC finishes

147
Q

A paint film of __ mils to __ mils is to thick and the paint should be removed chemically or abraded off with a coarse sand paper.

A

12

14

148
Q

As part of the surface evaluation, you must also determine whether the vehicle has been repainted. There are 3 ways to determine this, name 2

A

visual inspection

the sanding method

the paint film thickness

149
Q

When _______ is added to primer surfacer, it speeds up the rate of cure.

A

accelerator

150
Q

Name 2 characteristics of zirconia alumina

A

bluish grey

rugged, synthetic non-metal abrasive

blockier, but sharper grain than aluminum oxide

comes in paper sheet and disk form

very well suited for heavy grinding and sanding

provides free, cool cut, which results with less loading

self-sharpening action as it breaks down

requires less sanding pressure

more cost effective alternative to traditional silicon carbide and luminum oxide

longest lasting of all abrasives

151
Q

Do not ___ or ___ the body filler. It will add to much air, which will create pinholes.

A

whip

stir

152
Q

The two main types of abrasives used in dry sanding operations are

_______ oxide

_______ alumina

A

aluminum

zirconia

153
Q

Light bodied seam sealers are used to fill seams less than _/_”

A

1/8

154
Q

name 2 charcteristics of silicon carbide

A

Bluish black

it is very sharp (needle like) deep penetrating abrasive

it lasts very well on painted surfaces

it breaks down and dulls readily when used on steel and other hard materials

it is usually a finer grit

155
Q

Solid seam sealers, otherwise known as _____ caulking or __-__ are used to fill voids at panel joints or holes.

A

strip caulking

Dum-Dum

156
Q

Composite solvent cleaners are different from standard solvent cleaners in that they are typically ___-_______ or much less ______ than standard cleaners.

A

non-flammable

flammable

157
Q

You should wear a respiratory system when wet sanding. True or False

A

False

It does not produce any dust so there is no need for a respiratory system.

Autobody Technician Year 1 (2 decks)

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