Sherwin-Williams introduces Extreme Block Primer/Sealer

Sherwin-Williams introduces Extreme Block Primer/Sealer, a versatile indoor/outdoor formula, to its extensive coatings lineup. The new oil-based primer reduces the need for repaints by sealing off stubborn stains such as smoke, fire and nicotine, making it ideal for quickly restoring a property to fresh condition.

“Extreme Block joins other recently introduced coatings, such as Extreme Cover™ Stain Blocking Paint and Primer in One, as a key product in the property management and residential repaint toolkit,” said Steve Revnew, senior vice president of product innovation, Sherwin-Williams. “The fast-drying formula and powerful stain-blocking properties make it a great option for multifamily property managers, facility maintenance crews and other professionals looking to save time and maximize results.”

This fast-drying primer can be top-coated with either acrylic or alkyd products in as little as two hours and adheres well to multiple substrates including wood, drywall, masonry and prepared metal. Extreme Block is easy to sand to a uniform surface and provides lasting adhesion through deep surface penetration.

Now available, Extreme Block Stain Blocking Interior/Exterior Alkyd Primer/Sealer can be purchased in Sherwin-Williams stores nationwide. For more information, visit


For more than 150 years, Sherwin-Williams has been an industry leader in the development of technologically advanced paint and coatings. As the nation’s largest specialty retailer of paint and painting supplies, Sherwin-Williams is dedicated to supporting both do-it-yourselfers and painting professionals with exceptional and exclusive products, resources to make confident color selections and expert, personalized service at its more than 4,200 neighborhood stores across North America. For more information, visit Join Sherwin-Williams on Facebook, Twitter, Pinterest and Instagram.


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