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How To Paint Over Fibreglass

Follow our 3-step guide below on how to paint over fibreglass for interior and exterior projects, with Zinsser Bulls Eye 1-2-3, Perma-White, and Allcoat products – click here to skip recommended products and to continue reading.

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Zinsser Paint Over Fibreglass Products – The Benefits

Fibreglass 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. Zinsser’s Bulls Eye 1-2-3 is ideal for priming fibreglass as it provides a perfect key for topcoats.

Zinsser listens to contactors and develops new products – or adds features to existing products – to meet their changing needs, delivering world class products that meet “real world” challenges, providing tried and tested solutions to painting problems, such as painting over fibreglass.

Step 1. Surface Preparation

Prepare surfaces by ensuring they are clean and dry, free from anything that can interfere with the application or adhesion of materials and Zinsser 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 Zinsser Mould Killer & Remover to treat areas (in accordance with the manufacturer’s instructions) before allowing them to dry.

Step 2. Priming

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 Zinsser Bulls Eye 1-2-3.

Apply the primer in accordance with the manufacturer’s instructions and allow a minimum drying time of 1 hour (in normal drying conditions).

Step 3. Decoration

Decorate interior surfaces with two full coats of Zinsser Perma-White Interior, in accordance with the manufacturer’s instructions, and allow a minimum drying time of two hours between coats.

Zinsser Perma-White Interior is available in Matt, Satin and Semi-Gloss finishes with over 4,000+ colours from RAL, NCS, and British Standard.

For exterior projects, decorate with two full coats of Zinsser AllCoat Exterior in accordance with the manufacturer’s instructions. Allow a minimum drying time of one hour between coats.

Available in water-based and solvent-based products, Zinsser AllCoat Exterior has Matt, Satin and Gloss finishes in a selection of over 4,000+ colours from RAL, NCS, and British Standard.

More Information

If you require more advice on painting over fibreglass, give our technical team a call on 0113 2455450 (option 2) or send a message to [email protected].



  1. Cleaning, priming, painting.
    Can I clear coat after all this?
    What brand of clear coat do you recommend?

    • Hi Douglas,

      Thank you very much for getting in touch.

      The clear coat we could recommend would depend on the surface to be painted, be it a topdeck of a boat, a flat roof etc. If you could please supply us with some information on this we would be very happy to assist.

      I hope this helps and we hope to hear from you soon.

      Many thanks

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