HQC Anti-Mould Additive Add Mould-Resistance to Paint, Wallpaper Paste and Grout HQC Anti-Mould Additive is a biocidal additive that imparts paint, wallpaper paste and grout with mould-resistance. Simply mix the correct amount of additive directly into the desired material and apply as normal. Once dried, the treated surface will resist the growth of mould for at least 5 years, even in areas with persistent condensation.
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