Da with 80, 2 coat epoxy, wet sand, then paint?

R

Revolver

Just a quick spray on a racecar. Can I da the 2 (or more) coats of spray bomb flat black off a car with 80 grit, spray 2 coats of epoxy on it, wet sand that with 400 or 600, spray base and clear and be alright? The color is a dark grey metallic. It will be within the 7 day window of the epoxy. If not, would buzzing the 80 grit scratch with 180 or 220 before the epoxy help? This job is kinda out of my comfort zone, (I like to take my time) and could use a little advice.

Thanks, Gregg
 
You don't want to try and fill 80 grit scratches with epoxy and paint it within the recoat window-it will be a shrinkage mess. Use finer grits to sand off the spray bomb paint or better yet wash it off with solvent if that works and then sand with 180 then 320 before shooting the epoxy
 
The coarsest paper we ever use for a seal and shoot is 220. If the substrate, the underlying materials, are OK, there won't be a real problem. If the substrate is soluble and absorbs too much solvent from the sealer and fails to release it in time, the job may look a real mess after spending some time in the sun.

I am definitely with Bob in that you should not use 80. 80 is for stripping paint, or sanding bare metal or filler. It's not a prep grit under any condition, imo.
 
Thanks, guys. Deep down, I was pretty sure it wouldn't work. lol I actually have already sanded half the car with 180, but was burning thru a lot of paper. And I think i'll run some finer grits over the car before the epoxy.

Once again, you guys come thru with the answers and advice.

Thanks, Gregg
 
Last late model race car body I sprayed was a combination of prefinished steel, aluminum, gel coated fiber glass and molded plastic (adpro required).
Used 320 paper and red Scotchbrite, water W&gr, 1 coat epoxy 1:1. Next morning dry scuffed with 400, cleaned and sprayed single stage black Nason. Came out great, fast easy nice to not have be so fussy for a change.
Car made about 12 laps and got destroyed. Course I checked the adhesion on all the various materials that were bent and nothing popped off.
 
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