ABOUT HIGH HIDE COVER-STAIN® PRIMER Get premium hiding power indoors and out—plus lower VOCs (350)—with Rust-Oleum® Zinsser® High-Hide Cover-Stain® Primer. This whole-house, oil-based primer-sealer blocks stains, hides dark colors, prevents tannin bleed and penetrates and seals exterior wood. Oil-base primer-sealer Interior and exterior Blocks cedar & redwood bleed Use for fire, smoke & water damage Sticks to all surfaces without sanding Fast drying - recoat in 2 hours