: I have a wood paddle that has a crack in the blade and I would like to repair
: it with epoxy and glass. But I am worried the epoxy will not stick because
: the wood has been treated with linseed oil and tung oil. Any suggestions
: as to the best way to prep the wood before applying the epoxy? Any help
: will be much appreciated.

If the paddle was only oiled on the outer surface (not in the crack), it will only have penetrated a few thousandths of an inch. A light sanding will remove the finish completely, leaving the surface ready for epoxy and glass.