[brimcp99]

Epoxy Primer, Urethane Primer Compatibility

Hey guys, new here, Im from New Zealand and into Jap cars but really admire hot rods also. I have noticed alot of people on this forum have good knowledge in regard to paint technologies and correct procedures. I have got into panel beating and painting as a hobby and Im respraying my Dads truck at the moment after doing my own and friends vehicles.

I want to use an epoxy primer over the bare steel areas then use a 2k filler primer on top of this for block sanding as I have found 1k etch primers are prone to stone chipping.

After looking at some posts on here and data sheets it has become obvious that epoxy primers don’t really fully cure for up to a week from application, however 2k primers can be put over in as little as two hours after the last epoxy coat is put down. From what I have managed to find it doesn’t really seem to be a no no to use a different brand of 2k primer over the epoxy even if its not fully cured.

It just seems to me that if you have got two different types of chemical reactions going on (one uses Isocyanates and the other resins) that there could be potential for trouble if different brands are used. Ive already got 4 Litres of 2k primer that’s been used on other projects and want to use it but just want to check I can use another brand epoxy primer underneath.

Everyone seems to do it but it just seems dodgy??