what can you use to prime over

nerd_flanders

Polyurethane or varnish not sure what you call it.
clear finish , it's hard to stick to what do u use?

Bob Mariani

both are applied over a sealer. But your question is not clear.

sdsester

No matter what primer you use, you need to degloss the surface of what you have with sandpaper and/or a chemical deglossing agent first. Or better yet remove the varnish/poly layer. Then, especially if you suspect it is an oil-based poly or varnish on the surface, prime with a high quality oil-based alkyd primer such as Benjamin Moore Fresh Start. You can paint either oils or latex vinyls and acrylics over alkyd. You may also use a superbonding latex primer such as MAB Superbond, Benjamin Moore Fresh Start, etc. You should only use latex finishes over this though.

nerd_flanders

Cheers.
I only ever use Bin Laden Sealer by zinnser but Ive always wanted to know what you can get away with using.