Prymax GRP Primer

Prymax GRP Primer is a high-performance polyurethane primer designed to significantly improve the bonding of polyester resins and GRP systems to concrete, wood and metal substrates.

Its moisture-curing formulation allows application in damp (but not wet) conditions and at lower temperatures, making it ideal for challenging site conditions where standard primers may fail. Once applied, Prymax GRP Primer penetrates porous surfaces and prepares them for strong chemical adhesion.

When the primer reaches a partial cure, polyester resins applied over it will chemically bond to the surface, creating an exceptionally strong and reliable interface. This makes Prymax GRP Primer an excellent choice for bonding GRP laminates to porous and metal substrates in roofing, flooring and structural applications.

Prymax GRP Primer is easy to apply and provides consistent, dependable performance when used as part of a GRP installation system. It is particularly effective where enhanced adhesion and surface preparation are critical to long-term durability.

Available Sizes

Prymax GRP Primer is supplied in a range of container sizes to suit different project requirements:

• 1kg – ideal for small repairs and localised GRP bonding jobs
• 2.5kg – suitable for medium-sized preparation and priming works
• 5kg – ideal for larger GRP installations and trade use
• 20kg – suitable for extensive commercial or industrial applications

KEY PRODUCT FEATURES

• Polyurethane bonding primer for GRP systems
• Improves adhesion of polyester resins
• Suitable for concrete, wood and metal
• Moisture curing – usable in damp conditions
• Performs in low temperatures
• Ideal for GRP roofing and laminating applications

Here are 5 more great reasons to buy from us:

Returns are easy, if the items are�unopened and unused�then simply�contact us�for a returns number and send your item to our returns centre for fast processing. We'll get you a replacement or refund in a snap!

In the unlikely event that you find your item cheaper at another online store, just let us know and we'll beat the competitor's pricing hands-down.

We insist that you love everything you buy from us. If you're unhappy for any reason whatsoever, just let us know and we'll bend over backwards to make things right again.

Ordering from APEX Fibreglass Roofing Supplies is 100% safe and secureso you can rest easy. Your personal details are never shared, sold or rented to anyone either.

Here are 5 more great reasons to buy from us:

Returns are easy, if the items are�unopened and unused�then simply�contact us�for a returns number and send your item to our returns centre for fast processing. We'll get you a replacement or refund in a snap!

In the unlikely event that you find your item cheaper at another online store, just let us know and we'll beat the competitor's pricing hands-down.

We insist that you love everything you buy from us. If you're unhappy for any reason whatsoever, just let us know and we'll bend over backwards to make things right again.

Ordering from APEX Fibreglass Roofing Supplies is 100% safe and secureso you can rest easy. Your personal details are never shared, sold or rented to anyone either.