ProBlock 100 Oil-Modified Low VOC Primer

Description

Achieve the legendary stain-blocking performance of a traditional oil-based undercoat while meeting strict environmental air regulations with Sherwin-Williams ProBlock 100 Oil-Modified Low VOC Primer. This high-performance architectural primer is engineered using advanced oil-modified alkyd resins that deliver superior penetrative adhesion and stain-suppression while maintaining a low-VOC, reduced-odor profile. It acts as an impenetrable chemical seal over interior drywall, plaster, cured masonry, and raw wood trim, permanently blocking and isolating difficult bleeding stains caused by water damage, smoke soot, grease markers, and active wood tannins. It controls surface suction to ensure an absolutely uniform topcoat sheen holdout, preventing uneven absorption or “shadowing” when applying decorative latex or oil enamels. The formula dries quickly to form a hard, sandable layer that anchors tightly to glossy, aged finishes, making it an excellent choice for eco-conscious residential renovations, historical restorations, and commercial property maintenance.