Applying the Fibrelast base resin

A guide on how to apply the Fibrelast GRP roofing base resin system

Resin guide

As per our fibreglassing guide, we recommend that you should use either 1 layer of 600gm or 2 layers of 450gm fibreglass matting, for this example, we will be using 1 layer of 600gm fibreglass matting. If you allow for 1.5 kgs of Fibrelast base resin per square metre, this should give you excellent pinhole-free coverage.

1 layer of 600gm

Use approx 1.5 kgs of Fibrelast resin per m²

2 layers of 450gm

On each layer use approx 1.2 kgs of Fibrelast resin per m²


Laminating is a term that describes the application of catalysed resin to the fibreglass matting. Start off by mixing a small amount of resin to laminate any details like pipework and trim overlaps. Laminate the fibreglass bandage around the trim to deck joints along with the decking joints if you haven’t used a T&G board.

Using a resin application roller generously apply catalysed Fibrelast base resin mix to the deck on an area no greater that 3m²

Place the pre-cut fibreglass section over the saturated deck and apply more catalysed Fibrelast resin over the top of the fibreglass.

Allow the fibreglass and Fibrelast resin mix to activate the binder before working the resin through the fibreglass with a consolidating roller.