I'm in the weeds right now in trying to finish my first build. The big issue is that the plan keeps changing...I was going to paint it myself with a 2K urethane. After receiving warnings from some bike builder/painter friends, I decided to have a pro paint it, but my wife and daughter temporarily convinced me to keep the body a natural color which then was reinforced by some horror stories I've read about pro painters in addition to the fact that one of the good ones hasn't responded yet. I realized that I wouldn't be happy with the guitar if I left it natural so I've just ordered some paints from ReRanch but... I may have made some mistakes while dinking around with sealers and grain fillers. I got a sealer from my local Ace hardware that said it was good under urethane and put a coat on. After two days, it was still tacky, so I panicked and took as much off as I could with acetone. Surely it didn't all come out as the body still felt soapy but after about ten sessions it was feeling mostly smooth and dry again so I sanded it back a little. It clogged my paper up after every few strokes so something was still clearly on there but it wasn't tacky anymore so I moved on... ...mixed up some shellac and put a few wash coats on. It felt like shellac and I thought all was good until I went through a couple of sessions with Behlens Por-O-Pac. I've never used it before and assumed it would setup hard, but it's really chalky. Most of the pores have been filled and for those of you familiar with rock climbing, it felt like some greasy, over-chalked rock. Again, I tried sanding it back and the paper clogged up immediately. At this point, I feel like "F-it" and put on a few more wash coats just to hold the grain fill in place. A few minutes ago, I read the label of the Ace sealer which says not to use it if using laquer. It wasn't the plan, but the plan changed. At this point, I'm planning to go over it with shellac and pumice to hopefully fill in the remainder of the small grain and then shoot the primer next week and see what happens. Assuming this sealer doesn't come back to haunt me (I'm sure it will) is it OK to shoot nitro over shellac?