Extreme Block Waterbased Interior Primer Clear

Description

Lock down tough, bleeding interior stains completely while maintaining substrate transparency with Sherwin-Williams Extreme Block Waterbased Interior Primer Clear. This advanced architectural sealer is engineered to deliver heavy-duty stain suppression in a specialized, clear-drying acrylic formulation. It is designed to isolate and permanently lock away challenging stains caused by water damage rings, smoke soot residue, grease spills, crayon marks, and persistent wood tannins. Because it cures to an entirely transparent, crystal-clear film, it is the premier choice for sealing surfaces before applying specialty topcoats, creating a protective barrier without altering the underlying paint color or architectural graphics. The low-odor, low-VOC formula flows out smoothly across multiple interior substrates, including bare drywall, plasterboard, raw trim work, and cured masonry, sealing surface porosity variations to guarantee an absolute, uniform sheen holdout for your final decorative layers.