I might have already answered my own question, but going to shoot this out anyway. I'm about to paint a nice ash JM body, but need to use some filler before anything goes on it, and I've pretty much settled on getting some Tomahawk "Grain Filler."($24 for qt/946ml) A couple questions actually. 1. Tomahawk also sells a grain filler thinner. (also $24) Should I assume it's best practice to use their thinner? 2. Can you use a wood filler instead? I'm thinking that it might not be viscous enough to get into the small areas since it's meant more for larger voids. It'd be nice to just go to Home Depot and get it. For some reason the guy there was like "no idea what grain filler is. You mean wood filler?" Nope. Anyway, thoughts?