Well, I used to be die-hard fan of Zinsser products and they are fabulous -- (Cover Stain or Smart Prime) will cover most anything. I've also used the Sherwin Williams product called PrepRite Pro-Block and was NOT satisfied.

I've recently stumbled upon KILZ MAX Primer by Masterchem and it is the bomb ($33/Gallon). Dries fast, little odor, covers completely with no bubbles or bleed-thru, sands nice ... I'm in love. LOL. I've used this product on drywall, stained paneling and an old rustic stained/painted rocking chair and it covered/sealed superbly with one coat.

I'm just an amateur but that's my 2cents. A professional will certainly weigh in and give you more informed advice.

Good luck!

This post was edited by PinesEverywhere on Fri, May 3, 13 at 21:22

Sand( lightly) clean, prime with Zinsser 123, topcoat with whatever.