You can buy Salvation Solution Wood Stain Blocker by Debi's Design Diary DIY Paint in a 16 ounce size. Use DIY Stain Blocker to fix paint bleed through that causes discoloration on your painted pieces.
Debi's new stain blocker is a primer, blocker, and stain killer all in one. Finally a solution to those nasty stains! DIY stain blocker prevents wood tannins from bleeding through your painted surface. Available in both CLEAR and WHITE.