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AMT SWE > Paints and Sealants > Flashcards

Paints and Sealants Flashcards

1
Q

What is the primary purpose of paint?

A

Provide a protective film barrier/prevention of corrosion.

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2
Q

What are the 4 main contaminants that cause aircraft corrosion?

A

Moisture, Salt, Soil, and Aircraft Fluids

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3
Q

What is the primary purpose of sealants?

A

Prevent the movement of liquid or gas from one point to another.

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4
Q

What is the primary manual for paints/sealants?

A

NAVAIR 01-1A-509, Chapter 7

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5
Q

What are the three types of sealants?

A

Drying- cures at room temperature.
Curing- needs a base and an accelerator.
Pliable- gel sealing tape.

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6
Q

What are the three types of units of issue for sealants?

A

Two part can kit, semkit cartridge, premixed and frozen

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7
Q

What are the most common sizes of premixed and frozen sealants?

A

2.5 oz and 6 oz

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8
Q

What are the three most common applications types for sealants?

A

Type 1- brush/spatula applied
Type 2- extrusion gun
Type 3- flaying surface

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9
Q

After a sealant reaches shelf life, what is required prior to application?

A

Reinspection.

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10
Q

How wide should strips of sealant be applied?

A

1/8in - 1/4in

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11
Q

What is the purpose of flaying surface sealing?

A

Used for the assembly of components, between the contacting surfaces.

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12
Q

A water break free area refers to what?

A

An area that has been cleaned prior to painting. When fresh water is applied, the surface should be free of water breaks (beading or incomplete wetting.)

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13
Q

What is a chemical conversion coating?

A

An aqueous acid solution of active inorganic compounds which convert aluminum or magnesium surfaces to a corrosion resistant film.

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14
Q

What is the most effective means for cleaning the metal surface so that it will accept a pre-paint treatment?

A

Abrading the area with a very fine or abrasive mat.

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15
Q

What is the chemical conversion coating for aluminum?

A

MIL-C-81706

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16
Q

What are the application methods for chemical conversion coatings?

A

Brush, Touch up pens, Immersion, or Non-Atomizing sprayer

17
Q

What is the process of making a smooth and overlapping transition between old and new paint films?

A

Feathering

18
Q

How much should each stroke overlap the next when spraying?

A

50%

19
Q

How thick should the primer layer be?

A

.6-.9 mils

20
Q

How thick should the paint top coat be?

A

2 mils

21
Q

What is the only authorized primer to be used on CG aircraft?

A

Epoxy Polyamide MIL-P-23377 (Type 1)

22
Q

What is the pot life of primer?

A

4 hours at 75*F

23
Q

How long should primer stand after mixing and before applying and why?

A

30 minutes, so entire chemical reaction can take place.

24
Q

What is the minimum air temp to spray primer?

A

50 F or 10 C

25
Q

Within how many hours should topcoat be applied after primer application?

A

24 hours

26
Q

What is the distance the hangar has to be cordoned off during painting?

A

100 FT

27
Q

Polyurethane paint should be applied in what humidity and temperature ranges?

A

30-80% humidity and 60-90F

28
Q

How many hours will it take for paint to dry to a hard surface?

A

8 hours

29
Q

To measure viscosity of paint, what are the two most widely used measuring devices?

A

2 Zahn and #4 Ford cups.

30
Q

The viscosity of primer should be thinned to what?

A

17-19 seconds. (Meaning it should take 17-19 seconds for the paint to completely drain out the bottom of the cup.

31
Q

When using a 20-foot air or fluid pressure hose, and approximate pressure of ____ should be maintained for spraying epoxies or polyurethane.

A

50 PSI

32
Q

What are the three types of spray guns used for aircraft painting?

A

suction feed
pressure feed
gravity feed

33
Q

Gravity feed gun cups are limited to ___ ounce capacities due to weight and balance.

A

32 ounces

34
Q

Gravity feed guns are ideal for small applications such as what?

A

spot repair, detail finishing, or finishing in a limited space

35
Q

How many inches should the spray gun be held from the work during application?

A

6-10 inches

36
Q

Paint rooms shall be separated from other rooms by what?

A

Fire resistant walls

37
Q

Containers of not more than ____ capacity will be used for storing paints and dopes.

A

5 gallon

AMT SWE (32 decks)

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