[simpits-tech] Paint

[Fred Mahone]

Alan,

	I was out sick yesterday so I had some time to really read  MIL-P-778F to 
try and figure what type of paint is used.

	In the testing, they refer to application of the various fluids that the 
plates may come in contact during its life. There are some
hydrocarbon based fluids and a cleaning with lacquer thinner, this rules 
out regular acrylic and lacquer finishes. Looking under the
specifications for aircraft grade polyurethane paints, both solvent and 
water based, the finish is impervious to these chemicals.
In reading the MIL specification closer, it is up to the manufacturer to 
use a finish that will pass the testing, so they can use whatever they want.

	The base coat is a non-pigmented white. I have been in an automotive 
finish supplier and have seen them add tint. The base is always white with 
a milky appearance. As long as the base is compatible with the topcoat, you 
can probably use an automotive
polyurethane finish. A good pain jobber can take a sample of the original 
color (like an original face plate) and color match it.

	Of course, you cannot get this type of paint in a spray can as you have to 
add an activator to the primer and top coat. You will have to go to an 
airbrush.

	Also, make sure the plastic surface is really clean, including oil from 
touching the panel. When I paint, I clean the surface with a detergent for 
dishes that has no perfume or coloring agents. The brand I use is called 
"Octagon". I also wear a pair of plastic gloves they sell in the paint 
store, generally green in color. I put them on then wash the outside to 
remove and oils or powders that may be on them. Make sure they are dry 
before handling the panel before painting.

	I hope this helps and I will continue my research.

Fred Mahone