Sure-Block II is an interior/exterior alkyd stain blocking primer that seals bare and previously painted surfaces. It seals out burned or charred surfaces, holds back water stains and seals back lipstick, crayon, ball-point ink stains, smoke and grease. Sure-Block II is formulated for use on both commercial and residential surfaces where the use of a stain blocking primer is required. Use on surfaces such as wood, plaster, and drywall surfaces in kitchens where grease and smoke stains are a problem. Seal fire and smoke damage on walls, ceramic and plaster tile. Sure-Block II is also suitable for use as an exterior wood primer to seal water soluble tannin stains.