Get some z-poxy finishing resin, (mix as per instruction) a little goes a long way use an auto body squeege or credit card type to spread it out and remove the extra, put on a very thin layer just enough to soak throught the cloth to the wood. This stuff has a long cure time and very easy to work with. Best thing is to let it set over night then wipe it down with a cloth damp with denatured alchol or acetone, gets rid of that sticky top coat and then sand away.

egor