TCP-HF was developed by the department of the Navy to coat aircraft frames before painting. This coating was developed to reduce the Hexavalent chrome in standard conversion coatings such as Alodine. Independent laboratory tests show that TCP-HF out performs Alodine by 3:1 for salt spray testing. TCP-HF is also the only Trivalent Pretreatment to be listed on the Qualified products listing. It also passes the specifications for MIL-C-5541, Class 1a and Class 3 clear conversion coatings. TCP is used for corrosion resistance but not abrasive resistance. It leaves a very slight light gloss on the aluminum. It does not build a thickness layer it instead converts the outer layer of the aluminum. Contrary to Anodizing TCP-HF does allow conductivity of electricity.