Reply to "BEST BARE METAL COATING"

I have achieved the best results by using the following methods:

After blasting I apply self etching primer. As soon as I have finished shooting the primer I apply two pack (urethane) in body colour or black, solvent based not water based. It's very important to overcoat the primer within a few hours, the sooner the better for maximum adhesion. If I am spraying a small part I overcoat the etching primer as soon as it has flashed off. If you leave it until the next day it would be necessary to Scotchbrite the primer and even then it would not be nearly as well stuck as if you had done it immediately after shooting the primer and would chip off much easier.
I then overcoat that with Wurth body schutz (or equivalent product from 3M).

I would not use Por 15 at all. From what I understand it was developed to paint over rust and does that very well but does not adhere to clean metal nearly as well as self etching primer.

Always call the tech line number on the side of the tin to make sure you get the drying windows right, this is the key to maximum adhesion. Dont use anything that comes out of a rattle can unless it's small unimportant parts that are not worth cleaning you gun out for.

Wear an air fed respirator for anything containing isocyanate.

Johnny