Actively prevents rot and decay Colourless preserver for both interior* and exterior use. *Occasionally wet or interior wood with risk of condensation. For use as a basecoat before painting, staining or varnishing Water based Cuprinol Wood Preserver Clear is a colourless general-purpose preserver for interior* or exterior use prior to painting, staining or varnishing. It gives deep penetrating protection to sound wood against decay, mould and blue-staining fungi. *Occasionally wet or interior wood with risk of condensation.
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