Hi guys, First kit guitar build & first post. I'm in the same predicament.
Read that sanding sealer is great. I go out, buy it, paint it on the ash body and sand it back. It feels nice and smooth.
I plan on spray painting this guitar with my father in law as he has a spray gun & compressor, so I've got the paint all ready to go, Primer, thinners, acrylic & top coat. (automotive paint).
I tell him about this sanding sealer, and he looks at me "is it oil based"? Oh crap, I can't remember. Go home, look, yep, it's feast & watson oil based.
Crap.
The plan now is to grab a spare piece of wood and test it first with the sanding sealer & primer.
I had planned on staining this guitar, but realised once it arrived that affordable(cheap) guitar kits are not made up of single pieces of wood. The different grain patterns would've annoyed me to no end.