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    Polyester Resin Fillers

    For repairs that require both speed and strength, a resin filler is the go-to solution for professionals across multiple industries, especially Automotive Refinishing. When you need to fill dents, deep scratches, and imperfections quickly without sacrificing durability, a polyester Filler provides a tough, reliable, and easily workable repair. At Nebula Paints, we supply high-quality, professional-grade resin fillers designed for fast, effective results.

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    On saleP51 1Kg Glass Fibre Filler Incl. Hardener (1KG) in a tin container by Mipa, green polyester filler for automotive repairs.
    3 Sizes Available
    On saleP85 FIller 0.25 Kg - Mipa Fine White Filler canister for automotive refinishing and repairs.
    3 Sizes Available
    On saleRelo Polyester High Build Bodyfiller Including Hardener (250g)
    Save 25%Mipa P60S Grey Polyester Spray Filler with Hardener 1Ltr in canister, ideal for automotive and industrial filling applications.
    On saleMonofil Bridging Filler inc Hardener - Glass Fibre Reinforced Putty for Automotive & Marine Repairs
    2 Sizes Available
    Save 51%Relo Spray Polyester-Spray Filler (1 kg) in a can, designed for filling deep sanding scratches and surface imperfections.
    Relo

    Relo Spray Polyester-Spray Filler (1kg)

    Sale priceFrom £5.83 Regular price£11.97
    2K Transparent Putty 1ltr - Rosner transparent polyester putty container for easy sanding and professional finish.
    Mipa P19 E Styrene-Free Lightweight Body Filler (1L)
    Mipa P80 PE Hard Putty with Hardener 1kg in a metal can, ideal for automotive surface repairs.
    Mipa P99 Multi Star High Build Polyester Body Filler inc Hardener
    4 Sizes Available
    Mipa P27 Polyester Crystal Transparent Body Filler Putty Including Hardener (1kg)
    Mipa E90 2K Epoxy Putty 1 Kg canister for automotive and industrial repair applications.
    P12 Filler 3 Litre - Mipa Light Weight Filler can for automotive repairs with hardener.
    Monofil Multi Filler including Hardener - durable fibreglass-reinforced automotive and marine putty in a can.
    2 Sizes Available
    On saleRelo Fine Stopper incl Hardener 1kg can of premium two-component polyester putty for smooth surface finishing
    Relo

    Relo PE Fine Stopper incl Hardener (1kg)

    Sale priceFrom £4.16 Regular price£7.70
    Mipa P70 Aluminium Pigmented Filler 1kg canister for automotive and engineering repair solutions.
    2 Sizes Available

    Polyester Resin Fillers Frequently Asked Questions

    What is polyester resin?

    Polyester resin is a durable and fast-curing synthetic polymer that forms the foundation of most high-strength, two-part fillers. It is supplied as a thick paste that, on its own, will not harden.

    To activate it, a catalyst, typically a liquid or cream hardener, must be mixed in. This initiates a chemical reaction (polymerisation) that causes the resin to rapidly cure into an incredibly hard, rigid, and solid material.

    The resulting cured resin is known for its excellent strength, heat resistance, and sandability. It is a cost-effective solution for a huge range of repairs, allowing you to fill significant gaps and reshape damaged areas before sanding them back to a perfectly smooth, paintable finish.

    What is polyester resin used for?

    Thanks to its strength, fast-curing nature, and sandability, polyester resin filler is one of the most versatile repair products available. It is the go-to solution for filling and repairing dents, cracks, and holes in a wide variety of materials.

    Some of its most common applications include:

    • Automotive Body Repair: This is its most famous use. It's perfect for filling dents, scratches, and rusted areas on vehicle body panels.
    • Fibreglass (GRP) Repairs: It bonds exceptionally well to fibreglass, making it ideal for repairing cracks and holes in boats, canoes, caravans, and other composite items.
    • Wood Repair: It can be used to fill large, non-structural holes or rotted sections in timber, providing a very hard and durable repair.
    • Metal Fabrication and Repair: It adheres well to various metals, making it useful for smoothing weld joints or repairing damage on metal fabrications.
    • General DIY: It can be used to repair cracks in certain types of masonry or for creating custom shapes and moulds.

    Can I use polyester resin filler over an epoxy surface?

    Yes, you can apply polyester resin filler over a fully cured epoxy surface, but it is absolutely critical that the epoxy is prepared correctly first.

    The bond between polyester and epoxy is purely mechanical, not chemical. This means the polyester needs a rough surface to physically grip onto.

    The Correct Process:

    1. Ensure the epoxy is fully cured (check the manufacturer's guidelines, this can be 24-72 hours).
    2. Thoroughly sand the entire epoxy surface with a coarse grit sandpaper, typically between P80 and P180. Your goal is to remove all the surface gloss and create a uniform pattern of deep scratches.
    3. Clean the surface to remove all dust before applying the polyester filler.

    Crucial Note: You cannot do this the other way around. Never apply epoxy over a fresh polyester filler. Polyester resins release chemicals (styrene) as they cure, and if you trap these under a layer of epoxy, it will prevent the epoxy from curing properly and will cause it to delaminate and peel off.

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