OK... no on ever answered my "which woods need filler" question above, for like a guideline. The main ones I'm really interested in are Spruce, Lacewood, Rosewood, and Mahogany.
ALSO, about clear epoxy as a grain filler, and I noticed someone else mentioned this, but no response/reason was given, all the stuff you see at like ACE hardware and home depot has one tube of clear stuff, and one tube of slightly yellow stuff, so the epoxy isn't 100% clear.... is the "yellowed" epoxy fine, will it "yellow" my _____ (enter one of the four woods above)?
Lastly, about how much epoxy am I going to go through on one guitar to fill the grain with those woods?
Chris