Scuff Cured Epoxy Primer

[EngineerDoug]

Hello all,

I have a coat of epoxy primer on my project that is many weeks old. I am now moving into the next phase of the paint process. I know that this epoxy must have some "tooth" for the next coat of primer to stick, but I am unsure of how aggressively I need to scuff it.

On the major surfaces I had planned to go over it with some 220 grit, but how about the nooks and crannies? Will a red scotchbrite pad suffice? Whatever I use will be a pain to get into the little spaces like the taillight buckets, but do I need to use sandpaper? Or can I just cut the sheen with scotchbrite and be OK?

Your thoughts? Thanks.

 

[Scatpack]

Since the next coat is going to be primer, block with 220 and red scuff pad in tight areas. If you’re using the old school stiff as a brick red scuff pads, get the scuff pads as in the picture. A little more coin then the old stuff but once you use this stuff, you will never ever go back to the stiff scuff pads.

 

[EngineerDoug]

That's good news! Scuffing with pads in the tight areas will be a lot less tedious than using sandpaper. Next stop - primer surfacer.

Thanks.

 

[747mopar]

I do the same as Scatpack suggested.

 

[Pistol Pete]

I would scuff sand it, tack it off and blow a reduced coat of epoxy on it and let it sit 24 hours or so, then apply your primer surface. This will give you a chemical adhesion as well as physical.