Paints and Sealants

Question 1

What is the primary purpose of paint?

Answer 1

Provide a protective film barrier/prevention of corrosion.

Question 2

What are the 4 main contaminants that cause aircraft corrosion?

Answer 2

Moisture, Salt, Soil, and Aircraft Fluids

Question 3

What is the primary purpose of sealants?

Answer 3

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

Question 4

What is the primary manual for paints/sealants?

Answer 4

NAVAIR 01-1A-509, Chapter 7

Question 5

What are the three types of sealants?

Answer 5

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

Question 6

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

Answer 6

Two part can kit, semkit cartridge, premixed and frozen

Question 7

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

Answer 7

2.5 oz and 6 oz

Question 8

What are the three most common applications types for sealants?

Answer 8

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

Question 9

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

Answer 9

Reinspection.

Question 10

How wide should strips of sealant be applied?

Answer 10

1/8in - 1/4in

Question 11

What is the purpose of flaying surface sealing?

Answer 11

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

Question 12

A water break free area refers to what?

Answer 12

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.)

Question 13

What is a chemical conversion coating?

Answer 13

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

Question 14

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

Answer 14

Abrading the area with a very fine or abrasive mat.

Question 15

What is the chemical conversion coating for aluminum?

Answer 15

MIL-C-81706

Question 16

What are the application methods for chemical conversion coatings?

Answer 16

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

Question 17

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

Answer 17

Feathering

Question 18

How much should each stroke overlap the next when spraying?

Answer 18

50%

Question 19

How thick should the primer layer be?

Answer 19

.6-.9 mils

Question 20

How thick should the paint top coat be?

Answer 20

2 mils

Question 21

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

Answer 21

Epoxy Polyamide MIL-P-23377 (Type 1)

Question 22

What is the pot life of primer?

Answer 22

4 hours at 75*F

Question 23

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

Answer 23

30 minutes, so entire chemical reaction can take place.

Question 24

What is the minimum air temp to spray primer?

Answer 24

50 F or 10 C

Question 25

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

Answer 25

24 hours

Question 26

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

Answer 26

100 FT

Question 27

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

Answer 27

30-80% humidity and 60-90F

Question 28

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

Answer 28

8 hours

Question 29

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

Answer 29

#2 Zahn and #4 Ford cups.

Question 30

The viscosity of primer should be thinned to what?

Answer 30

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

Question 31

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

Answer 31

50 PSI

Question 32

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

Answer 32

suction feed pressure feed gravity feed

Question 33

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

Answer 33

32 ounces

Question 34

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

Answer 34

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

Question 35

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

Answer 35

6-10 inches

Question 36

Paint rooms shall be separated from other rooms by what?

Answer 36

Fire resistant walls

Question 37

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

Answer 37

5 gallon