Not dumb at all. You just buy it in the can that way, it's sold as "Boiled Linseed Oil". I'm sure you've heard all the cautions in regards to handling it (rags left with it on them will self ignite). John ----- Original Message ----- From: "Curt" <curt at imc-group.com> > I have a really dumb question. What really is "boiled" linseed oil?