I am curious how do you guys prep the parts before you paint? I have fairly complicated parts that came out of mold and it’s very time and labor consuming if I have to sand every part of the parts, are there any solvent that I can use to just wipe on or spray on then clear coat?
At work, we wet sand parts with a mix of deionized water and soap, and rinse with deionized water. We keep going until the water “breaks” (as in, doesn’t bead on the part). However, this is for aerodynamic surfaces of Airbus wing panels. I’m not experienced with “finishing”, but I’d expect you’d need to scuff the surface at the least, and probably rinse with solvent.
I dare say you will need to sand. usually the part comes out of the mould with some shine and is very flat. Most painters I know want items rubbed down with 800 grit.
If your mold surface is more coarse than at least 600 grit, you could get away with demolding and then just solvent washing the panels. degreasing soap and water, and then acetone to try and get rid of any release agent. if you’re using a semi perm that makes it a bit more complicated. some people will tell you that the only way to truly get rid of a semi perm is the sand off the outer most layer, or you could get unlucky and have you clear coat flake/chip off on you in the future. the real insult here is that the coarser the mold surface, the more difficulty you’re going to have releasing it. as with all things composites… trying to make one step easier usually makes another step harder 
When we do bonding, the surface prep is sanding and then solvent wash. Though many places now have been switching to sanding, and by sanding it’s just abrading the surface to increase the surface energy, then a dry wipe. You don’t want to see black coming off when you sand, or else that means you’re damaging fibers. If it’s non structural, I guess sand away. It doesn’t need to be sanded rough with 80 grit, just with enough to get the surface energized. Of course, paint peeling is probably less concern than a dis bond of a part.
Also you can use peel ply, if it’s less of a pain. Then sand, wipe/wash.
We use freekote as our release, as do many companies, and this is pretty standard for bond prep.
my 2cents