I have a few questions related to all of this... I have done a few coats of birchwood casey sealer/filler on a mahogany body, and it seems to not want to fill the grain, unless I really put it on thick. Of course, if I put it on thick, it dries unevenly, and needs to be sanded back. Assuming I can get a nice grain fill done with the sealer/filler, what do I want that surface to be like before I move on to the Tru Oil? Sanded flat? Sanded back so there's not too much sealer/filler aside from what fills the grain? Just roughed up a little with 220? Untouched (glossy & smooth?)? Any advice is appreciated. Thanks!