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Roofing GRP Topcoats
Roofing GRP Topcoats provide the final protective layer in fibreglass flat roofing systems, sealing and shielding the surface from weather, water, and UV exposure. Available in standard or fire-retardant formulations, these high-performance roofing finishes are designed for compatibility with new and refurbished GRP laminates. Ideal for garage roofs, balconies, dormers and extensions, they deliver a smooth, consistent finish and prolong the lifespan of the system when applied correctly.
Cromar PRO GRP Topcoat
For use in flat roofing applications where regulations specify a fire-retardant system. Conforms to BS476 Part 3:2004, FAB classification. Pre-pigmented, isophthalic acid based, filled fire-retardant roofing top-coat Excellent water and weather resistance providing a maintenance-free surface Tack-free and water-tight Exhibits good...
Bullet Roof GRP Roofing Topcoat
A roofing topcoat with fantastic thixotropy that clings to pitched and vertical roofs though the curing process, without running or slumping from the surface. Great cost/performances ratio Easy to use Easy to sand Available in 350+ colours on request Extra costs and longer lead times may apply Must be purchased and used with...
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High-Performance GRP Topcoats for Lasting Protection
GRP Topcoats are the essential final layer in fibreglass roofing systems, providing a seamless, weather-resistant barrier over cured laminates. Applied after GRP Primers, they cure to a durable, watertight finish that resists UV degradation and environmental wear. These topcoats are typically pre-pigmented for easy application and strong visual finish, with fire-retardant options available for specific roofing standards and building requirements. Application is straightforward with brush or roller, ensuring reliable coverage across complex surfaces.
Often specified as part of Complete GRP Roofing Kits, these topcoats offer excellent adhesion, long-term durability and ease of maintenance. Designed for both small domestic projects and larger commercial installations, GRP Topcoats are suitable for flat roofs, walkways, roof terraces and industrial zones. The topcoat forms the first line of defence against leaks, moss and UV damage, making it a key component in any fibreglass roofing system where protection and longevity are critical.
Roofing GRP Topcoats FAQs
Can GRP Topcoats be used over existing felt or asphalt roofs?
No, GRP Topcoats should only be applied over properly prepared fibreglass laminates. Felt, asphalt or EPDM surfaces are not compatible.
Can I walk on a roof after applying the GRP Topcoat?
Yes, once fully cured, GRP Topcoats form a hard, durable surface suitable for foot traffic in maintenance or access areas.
What’s the difference between standard and fire-retardant GRP Topcoats?
Fire-retardant versions are specially formulated to meet building regulations requiring resistance to flame spread and fire performance.
Do I need to mix anything into the GRP Topcoat before use?
Yes, catalyst (hardener) must be added to activate curing. Follow the manufacturer’s ratio carefully to ensure correct performance.