Cabot® Problem-Solver® acrylic primer is an acrylic-based, exterior primer that is specially formulated with LokzAll™ stain locking technology. This unique formula chemically bonds with extractive tannin bleed and locks the unsightly discoloration into the primer. The result is a surface that can be top coated and will be protected from discoloration. This state-of-the-art chemistry also provides resistance to mildew stains and moisture problems. Its acrylic formula remains flexible, resisting cracking, peeling or blistering. Recommended for use on new or previously stained surfaces including wood siding, trim, shingles, decks, plywood, manufactured hardboard, engineered wood products, cured stucco, masonry, brick, cementitious siding, asbestos siding and smooth or rough-sawn surfaces. It is suitable for use on woods such as redwood, red cedar, fir, pine, cypress, spruce and incense cedar.