Installing self-stick vinyl tile?

First off, let me say that I know there are better (more expensive) flooring options and that installing new underlayment is always recommended. However, I want to avoid laying new plywood, so I have removed a layer of vinyl tiles and the original vinyl sheeting to expose the luan underlayment. It appears to be in good shape and has minimal residue on it. What would you recommend I put on this underlayment to help adhesion of the tile?