How Do I Paint GRP?

GRP stands for Glass Reinforced Plastic. It is also called fibreglass, composite plastic or FRP. It is strong, extremely light and highly versatile. GRP can be tough to paint over as it needs to be suitably prepared and primed for topcoats to properly adhere and stick to the surface.

Prepare surfaces by ensuring they are clean and dry, free from anything that can interfere with the application or adhesion of materials and Tikkurila products to be applied, removing loose and failing material by scraping or brushing with a stiff bristle brush to a sound edge.

Feather the sound edges with a fine grade abrasive paper, removing all visible signs of organic growth and using Tikkurila Mould Removal Solution to treat areas before allowing them to dry

Use methylated spirit to ensure the surface is free from any contaminants and anything that could interfere with adhesion, frequently changing the cloth, before priming overall with one full coat of Otex Adhesion Primer.

Apply the primer in accordance with the technical data sheet and allow to dry.

Finish with two full coats of Panssari Akva. Follow the minimum drying times (depending on conditions as per the technical data sheet) between coats.

NB. Valtti Opaque and Unica Semi-Gloss are also suitable as topcoats if preferred

If you require more advice on painting over GRP, give our technical team a call on 0131 334 4999 or send a message here.