[lupo]

Mastercoat is not a knockoff of POR 15 it's the other way around. In 1978 Stan Coleman supplies sold POR 12 metal filler it only came in silver. This was the Mobay primer rust sealer. When Stanley died the company was taken over and they changed the resin ,the thinner, and the pigment and that's when the problem started with adhesion to clean steel and difficulty painting over it especially the Blacks and the clear. Mastercoat uses an entirely different resin different thinner and primer type pigments that paint adhere to and sticks to clean steel. Epoxies and moisture cured urethane's have been around for decades and are constantly evolving. In corrosive environments the moisture cured goes down first followed by an epoxy intermediate primer and then a topcoat. This will run outdoors for 20 to 30 years. A automotive body shop production paint job would not withstand this. So if you doing a production paint shop is one thing if you're trying to preserve something for future generations we combine in industrial base with a automotive topcoat for appearance purposes.

I'm going to do a salt fog test with epoxies, some self etching primer, Rustoleim rusty metal primer, fluid film and a rust converter I'll post a video on this message board.

If you'd like to build salt fog cabinet the directions are on the Internet it's very inexpensive and easy to do