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by Ron Joseph July, 2006 Finish Coat Over Zinc Chromate Primer
Q: I'm building an aircraft using Tempo zinc chromate primer over the 6061-T6 aluminium. What type of finish coat should I use that is compatable with zinc chromate primer? Here is information off the aerosol can which I hope will be of help:
Aviation Zinc Chromate Primer A7-6889 Yellow
Resin System: Alkyd Enamel
Federal Specification:
TTP-1757A
Mil-P-6889A
Type 1 Mil-P-8585A
Resistance:
Heat - 250°F
Abrasion - good
Adhesion - Excellent
Corrosion - Excellent
Dry Time:
Tack free - 15 to 30 minutes
Fully dry - 2 hrs
Recoat after two hours
Thanks for any assistance that you can give me.
A: You should use an alkyd or equivalent resin top coat, such as an acrylic modified alkyd, or a silicone alkyd. Unfortunately, the Tempo primer is unlikely to be compatible with a more durable topcoat, such as a two-component polyurethane.
Best wishes, Ron Joseph | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
