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    All Additives

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    On saleRelo Extra Fast Hardener 250ml in a can, designed for quick curing in paint and clearcoat systems.
    2 Sizes Available
    Relo

    Relo Acrylic Hardener (Extra Fast)

    Sale priceFrom £4.16 Regular price£7.85
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    Rosner Natural Expert Thinner 1 Ltr can for oil thinning and cleaning painting tools.
    Rosner

    Rosner Natural Expert Thinner 1 Ltr

    Sale price£8.48
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    Save 36%Rosner DD Evaporation 5 ltr - premium-grade thinner for solvent-based coatings.
    Rosner

    Rosner DD Evaporation Paint Thinner (5L)

    Sale price£33.33 Regular price£52.27
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    On saleAiro-Chemie Acrylic Thinner
    2 Sizes Available
    Airo-Chemie

    Airo-Chemie Acrylic Thinner

    Sale priceFrom £5.83 Regular price£11.24
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    On saleAiro-Chemie Acrylic Hardener 250ml in a metal canister, designed for use with Acryl-Füller 4:1, high solid content.
    2 Sizes Available
    Airo-Chemie

    Airo-Chemie Acrylic Hardener

    Sale priceFrom £5.83 Regular price£10.58
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    Rosner HydRo Hardener 0.5Lt - High-performance crosslinking additive for water-based coatings.
    Rosner

    Rosner HydRo Hardener 0.5Lt

    Sale price£20.57
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    Rosner HydRo Hardener 1Ltr - high-performance crosslinking additive for water-based coatings
    Rosner

    Rosner HydRo Hardener 1Ltr

    Sale price£41.66
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    Save 32%Rosner DD-Evaporation Nr. 20 1Ltr. Thinner for solvent-based coatings in a canister.
    Rosner

    Rosner DD-Evaporation Nr. 20 Paint Thinner (1L)

    Sale price£7.49 Regular price£11.09
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    Save 27%Rosner NaturExpert Oil Hardener 0.5Ltr - Oil hardener for enhanced durability and drying of wood oils.
    Rosner

    Rosner NaturExpert Oil Hardener (0.5L)

    Sale price£8.33 Regular price£11.41
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    Save 34%Rosner DD-Hardener 45 2.5 Ltr can, designed for professional wood finishing systems.
    Rosner

    Rosner DD-Hardener 45 (2.5 L)

    Sale price£26.66 Regular price£40.23
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    Rosner DuoCryl Hardener 2.5L can image for high-performance wood finishing systems.
    Rosner

    Rosner DuoCryl Hardener 2.5L

    Sale price£44.32
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    Save 24%Rosner DuoCryl Hardener 500ml container for clearcoats and PU topcoats.
    Rosner

    Rosner DuoCryl Hardener (500ml)

    Sale price£9.16 Regular price£12.09
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    Rosner Rocket Hardener 5L canister for high-performance clearcoat systems.
    Rosner

    Rosner Rocket Hardener 5L

    Sale price£183.90
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    On saleMonofil Vario+ Fade Out (500ML) professional blending solvent for automotive refinishing.
    Monofil

    Monofil Vario+ Fade Out (500ml)

    Sale priceFrom £9.99
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    Monofil 221 Additive (1LT) can for converting HS paints to 1K-Acryl systems.
    Monofil

    Monofil 221 Additive (1LT)

    Sale priceFrom £20.83
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    All Additives Frequently Asked Questions

    What products are included in the Additives collection?

    This collection includes paint hardeners and thinners used to prepare coatings for application and ensure optimum performance during spraying and curing.

    What is a paint hardener?

    A hardener is a chemical activator that reacts with compatible paint products, primers, clearcoats and fillers to initiate the curing process and create a durable final finish. - Always check the technical data sheet.

    What does paint thinner do?

    Paint thinner is used to reduce the viscosity of coatings, making them easier to spray and helping achieve a smoother, more even application. - Always check the technical data sheet.

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