INSL-X Max Block™ Advanced Water-Based Stain Blocking Primer (Formerly Block Out®)

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INSL-X Max Block™ (formerly INSL-X Block Out®) is the next generation of water-based stain-blocking primers, engineered to seal difficult stains, lock in tannin bleed, and provide exceptional adhesion on both interior and exterior surfaces. Developed through years of testing across multiple substrates and environmental conditions, Max Block delivers stain-blocking performance that rivals traditional solvent-based primers while offering a low-VOC, water-based formula.

Max Block effectively seals tannin-rich woods such as cedar and redwood, helping prevent discoloration and bleed-through in finish coats. It also blocks many common household stains and odors including water stains, smoke damage, nicotine, and other difficult discolorations.

Fast drying and easy to use, Max Block can be top coated in as little as one hour, helping painters complete projects faster without sacrificing performance.

Key Features & Benefits

• Formerly INSL-X Block Out®
• Advanced water-based stain-blocking technology
• Seals tannin bleed from cedar, redwood, and other extractive-rich woods
• Blocks water stains, smoke stains, nicotine stains, and household odors
• Interior and exterior use
• Excellent adhesion to vertical and horizontal surfaces
• Fast drying; top coat in approximately 1 hour
• Low-VOC formulation
• Soap and water cleanup
• Excellent hide, sealing, and holdout properties for a uniform finish

Recommended Uses

• New or previously painted drywall
• Plaster
• Wood trim and siding
• Cedar and redwood
• Masonry surfaces
• Water-damaged areas
• Smoke and nicotine restoration projects
• Residential and commercial repainting

Why Max Block Replaced Block Out®

For years, painters relied on INSL-X Block Out® for difficult stain-blocking applications. Max Block builds upon that reputation with an advanced water-based formula designed to deliver superior stain-blocking performance, improved environmental compliance, easier cleanup, and broader interior/exterior versatility.

COVERAGE: 300 – 400 Sq. Ft. per gallon

DRY TIMES: 

• To Touch: 30 Minutes
• To Recoat: 1 hour

SURFACE PREPARATION: Surfaces to be painted must be clean, dry, and free of dirt, dust, grease, oil, soap, wax, scaling paint, water soluble materials and mildew. Remove any peeling or scaling paint and sand these areas to feather edges smooth with adjacent surfaces. Glossy areas should be dulled. Drywall surfaces must be free of sanding dust. Spot prime before and after filling nail holes, cracks, and other surface imperfections.

New plaster or masonry surfaces must be allowed to cure (30 days) before applying base coat. Cured plaster should be hard, have a slight sheen and maximum pH of 10; soft, porous or powdery plaster indicates improper cure. Knife off any protrusions and prime plaster before and after applying patching compound. Remove any powder or loose particles.

APPLICATION: Stir product with a circular, lifting motion before you begin to paint. Max Block™ Water-Based Stain Blocking Primer may be applied by brush, roller, or spray, at a rate of application not to exceed 400 square feet per gallon. Surface texture and porosity will affect actual yield. For best brush application results, use a quality synthetic filament brush. For roller application use a 3/8” nap cover for smooth surfaces, a 1/2“ nap cover for semi-rough surfaces, and a 3/4” nap cover for rough surfaces. Apply at full strength for maximum stain blocking and sealing properties. Do not tint, thin or add any other paints or solvents.

Max Block™ seals the stain and prevents it from bleeding through into the topcoat. In typical usage, difficult stains may not appear fully covered and sealed by the primer and the first finish coat. The second finish coat should provide complete coverage of the stained area. Two coats of primer may be required on severe stains. For best results, top-coat with a latex or oil-alkyd finish in the same day.

COMPLIANCE & CERTIFICATIONS:

• FEDERAL
• OTC
• OTC II
• CARB
• CARB07
• CARB19
• UTAH
• AZMC
• SCAQMD
• Eligible for LEED® v4
• CDPH Emissions Certified
• Eligible for CHPS low emitting credit (Collaborative for High Performance Schools)
• MPI: 6, 39, 137