Paints and Sealants Flashcards
What is the primary purpose of paint?
Provide a protective film barrier/prevention of corrosion.
What are the 4 main contaminants that cause aircraft corrosion?
Moisture, Salt, Soil, and Aircraft Fluids
What is the primary purpose of sealants?
Prevent the movement of liquid or gas from one point to another.
What is the primary manual for paints/sealants?
NAVAIR 01-1A-509, Chapter 7
What are the three types of sealants?
Drying- cures at room temperature.
Curing- needs a base and an accelerator.
Pliable- gel sealing tape.
What are the three types of units of issue for sealants?
Two part can kit, semkit cartridge, premixed and frozen
What are the most common sizes of premixed and frozen sealants?
2.5 oz and 6 oz
What are the three most common applications types for sealants?
Type 1- brush/spatula applied
Type 2- extrusion gun
Type 3- flaying surface
After a sealant reaches shelf life, what is required prior to application?
Reinspection.
How wide should strips of sealant be applied?
1/8in - 1/4in
What is the purpose of flaying surface sealing?
Used for the assembly of components, between the contacting surfaces.
A water break free area refers to what?
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.)
What is a chemical conversion coating?
An aqueous acid solution of active inorganic compounds which convert aluminum or magnesium surfaces to a corrosion resistant film.
What is the most effective means for cleaning the metal surface so that it will accept a pre-paint treatment?
Abrading the area with a very fine or abrasive mat.
What is the chemical conversion coating for aluminum?
MIL-C-81706
What are the application methods for chemical conversion coatings?
Brush, Touch up pens, Immersion, or Non-Atomizing sprayer
What is the process of making a smooth and overlapping transition between old and new paint films?
Feathering
How much should each stroke overlap the next when spraying?
50%
How thick should the primer layer be?
.6-.9 mils
How thick should the paint top coat be?
2 mils
What is the only authorized primer to be used on CG aircraft?
Epoxy Polyamide MIL-P-23377 (Type 1)
What is the pot life of primer?
4 hours at 75*F
How long should primer stand after mixing and before applying and why?
30 minutes, so entire chemical reaction can take place.
What is the minimum air temp to spray primer?
50 F or 10 C
Within how many hours should topcoat be applied after primer application?
24 hours
What is the distance the hangar has to be cordoned off during painting?
100 FT
Polyurethane paint should be applied in what humidity and temperature ranges?
30-80% humidity and 60-90F
How many hours will it take for paint to dry to a hard surface?
8 hours
To measure viscosity of paint, what are the two most widely used measuring devices?
2 Zahn and #4 Ford cups.
The viscosity of primer should be thinned to what?
17-19 seconds. (Meaning it should take 17-19 seconds for the paint to completely drain out the bottom of the cup.
When using a 20-foot air or fluid pressure hose, and approximate pressure of ____ should be maintained for spraying epoxies or polyurethane.
50 PSI
What are the three types of spray guns used for aircraft painting?
suction feed
pressure feed
gravity feed
Gravity feed gun cups are limited to ___ ounce capacities due to weight and balance.
32 ounces
Gravity feed guns are ideal for small applications such as what?
spot repair, detail finishing, or finishing in a limited space
How many inches should the spray gun be held from the work during application?
6-10 inches
Paint rooms shall be separated from other rooms by what?
Fire resistant walls
Containers of not more than ____ capacity will be used for storing paints and dopes.
5 gallon
