About Americana Decor Stain Blocker - 

Use under Americana Decor paints to prevent stains, knotty wood, and tannins from resurfacing and discoloring finished pieces. Dries to a clear, durable finish. Apply paint in an inconspicuous area and check for stains after 3 hours. If staining appears, apply Stain Blocker/Sealer to affected areas or entire piece prior to painting. For best performance, allow to cure for 5 to 7 days before applying paint. To clean a finished piece, use soap and water on a soft rag or kitchen sponge. Clean up food or drink messes as soon as possible.