I have few questions about sanding. I sprayed ********** epoxy on my 1981 vette than I put 3 wet coats of slick sand on entire body. After I am done with sanding slick sand I will spray one more coat of reduced epoxy as sealer.
I am planning to block sand the slick sand with 180 grit and rigid block...what should I do next? I have 320, 400, 600 and 800 grit papers. I also have rigid and flexible blocks and 7'' DA sander and intermediate pad for it.
I want to finish slick sand with 400 grit and final sealer coat with 600-800 grit (as per my painters instructions) and give it to the shop for base/clear.
One thing that I am not sure is should I use rigid block for 320, 400, 600 and 800 or just 320 and rest with flexible block or maybe DA sander?
If you can tell me each step and what paper/block/tool I should use it will be great.
Thanks!!!
S.

I would sand your slicksand down to 320. then let the painter spray the reduced epoxy so you don't have to sand that coat. he will spray it wet on wet so there is no need to sand the epoxy. don't worry about sand scratches from the 320. the reduced epoxy will fill those scratches. just have the painter mix the epoxy 1 to 1 with about 20% reducer

One more question. The purpose of block sand the slick sand with rigid block 180 is to get the panels super straight. So lets say i already got every single panel 100% straight and I am happy with it. Whats the purpose of sanding with 320/400? Just to get rid off 180 scratches or maybe making the panel even flatter than with 180grit??
Because what keeps me confused is should i make everything perfec with180grit and rigid block and after that just fix 180 scraches with 320/400 or actually work the panels to make it even more flat with 320/400?
S.

I would use a guide coat on the 180 scratches so you know when they are all gone. as far as the 320 goes you will not get the panel any straighter it just smooths the panel out for paint.