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Ask the Expert Question-and-Answer Archive by Ron Joseph May, 2005 Applying CARC and MIL-C22750 Epoxy Q. We will be painting a tube for the Army with CARC Mil-C-46168. Is there any reason I need Mil-C-22750 ontop of that? I was simply going to use the following note: Paint external surfaces with CARC Mil-C-46168, color per fed-std 595 color 1787 A. MIL-C-22750 is an epoxy topcoat and MIL-C-46168 is a polyurethane topcoat,
so no, it does not make sense to the epoxy on top of the polyurethane. However,
what is your callout for surface preparation and priming? Your note should include
something like: "Prepare surfaces to TT-C-490 Type I or II followed by
primer MIL-P-53030 or MIL-P-53022 followed by CARC Mil-C-46168, color per fed-std
595 color 17875" Also include the film thickness ranges for primer and
topcoat. The surface prep callout will also depend on the substrate you are
using. Best wishes, Ron Joseph |