I've got 3-4 coats of epoxy primer on my motorcycle bodywork and let it air dry for a couple of days. I misted it with rattle can black as a guide coat and am wet sanding with 600P but keep going through the primer down to the bare metal or fiberglass, especially around the edges. I'm trying to be really careful in these places too!

Do you have any tips/suggestions? Should I try a different, softer sanding block or should I just hit it with a red Scotchbrite pad?

 

If you sprayed the epoxy and are ready for base, simply scuff with something like a grey scuff pad and shoot away. Or if your primer is a black color like dp-90 and your base color is a light color like yellow then simply scuff the primer, spray sealer, and then base it.

If you laid the epoxy in preparation to scuff and apply filler over, then there is no problem sanding through there, apply filler and just re primer when you are finished.

Now if you are trying to block the primer (which it sounds like) then you are using the wrong primer for the job. The epoxy primer is a excellent corrosion protector and acts as a good base for adhesion. If you want to block out sand scratches then you need a primer surfacer. These are the high build primers that you can build up a thickness and block out sand scratches, nicks, small chips etc.

 

swappedcx is right. try using feather fill its made by evercoat. Its a high build primer surfacer. plus its cheap

 

thanks!