GAF TOPCOAT Surface Seal SB Primer – White, 55-Gallon DrumTOPCOAT Surface Seal SB Primer, White (55 gal) Solvent based, sprayable thermoplastic rubber primer that cures into a seamless, reflective membrane. Designed to protect and flex with roof movement, ideal for modified bitumen and compatible roofing systems. Key Features: Seamless Protection: Cures to a continuous thermoplastic rubber membrane for durable roof sealing High Reflectivity: Helps reduce surface temperatures and protect roof substrates

TOPCOAT Surface Seal SB Primer, White (55 gal)

Solvent-based, sprayable thermoplastic rubber primer that cures into a seamless, reflective membrane. Designed to protect and flex with roof movement, ideal for modified bitumen and compatible roofing systems.

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Key Features:

• Seamless Protection: Cures to a continuous thermoplastic rubber membrane for durable roof sealing
• High Reflectivity: Helps reduce surface temperatures and protect roof substrates
• Flexible Formula: Accommodates temperature-driven expansion and contraction
• Pro-Ready Application: Sprayable solvent-based primer for efficient coverage
• Tested & Approved: Meets ASTM standards; CRRC, Energy Star, Miami-Dade, Florida Building Code, UL, and FM approvals

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Specifications Table:

Specification	Details
Color	White
Packaging	55 Gallon Drum
Coverage Area	100 Sq. Ft. (9.3 Sq. m)
Technology	Solvent-based sprayable thermoplastic rubber primer/sealant
Membrane	Cures to a seamless rubber membrane
Approvals/Certifications	CRRC Approved; LEED; Energy Star; Miami-Dade County Approved; Florida Building Code Approved; UL Classified; FM Approved
Standards	ASTM D412; ASTM B117; ASTM C794; ASTM G21; FTMS 141.6271; ASTM D2196; ASTM D1475; ASTM E1644
Style/Category	Adhesives, Caulks & Sealants
Manufacturer Number	89SD920WP
Product Number	GAFTCSSSBWHG55

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Frequently Asked Questions (FAQ):

Q: What surfaces is this primer intended for?
A: It’s formulated for roofing applications and commonly used as a primer on modified bitumen and compatible substrates per GAF guidance.

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Q: How is it applied?
A: It is a sprayable, solvent-based product; follow the product data sheet for equipment, coverage rates, and application conditions.

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Q: What is the color and packaging?
A: White color, packaged in a 55-gallon drum.

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Q: What approvals and standards does it meet?
A: It aligns with ASTM D412, B117, C794, G21, D2196, D1475, E1644 and holds CRRC, LEED, Energy Star, Miami-Dade, Florida Building Code, UL Classified, and FM Approved statuses.

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Q: What coverage can I expect?
A: Listed coverage area is 100 sq. ft. (9.3 sq. m). Actual coverage varies by substrate and application method.

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A Gleaming, Seamless Shield for Modern Roofscapes

This primer sets the stage for a roof that reads crisp and refined, casting a clean white sheen that elevates the skyline. I love its thermoplastic rubber chemistry—supple yet resilient—creating a continuous skin that moves elegantly with the building. Pair it with cool, minimal metal details and charcoal coping for a chic, high-contrast finish. It’s the quiet luxury essential that protects while polishing the entire silhouette.

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Elevate and protect your roof with TOPCOAT Surface Seal SB—order the 55-gallon drum today for seamless, high-performance coverage.