There is no need to over-think this. I use (nontoxic) Elmer’s paste to seal the bottom of the cart closed. I use American Spirit (flax) or Raw (hemp) cig papers and get great results. Nitrating may be necessary or advisable for some types of paper but not for those. Paper residue left in chambers is minimal to nonexistent and presents no problem whatever. Any left behind paper can easily be scraped out or just ignored until clean up time.