Patent Knotting solution is a professional shellac-based solution for sealing knots and resinous areas of bare timber prior to the application of paints, waxes or polishes. Patent Shellac Knotting Solution is naturally brown in colour. Where you wish to overcoat with a clear or lightly pigmented finish, consider using our White Knotting Solution which uses bleached shellac.
Shake well. Apply the solution liberally to prepared bare timber, over and around the knot or resinous area by brush. Apply 1-2 coats. Allow to dry between coats. When the treated area is to be overcoated with a water-based coating system, apply the knotting solution more sparingly, and once dry lightly abrade the surface to provide a key before overcoating.
Knotting solution can really only hold back extractive staining, from knots and resinous areas of timber bleeding through the paint coating film. It won't stop actual resin exudation, or bubbling of the paint film when the resin turns from a liquid into a gas. For these types of problems, gentle heating of the substrate to mobilise the resin, which you can wipe away with a rag dipped in methylated spirits, may help exhaust the knot. However problem knots often need drilling out and filling, and problem areas of resinous timber might need cutting out and splicing with new timber.
Touch dry 15-20 minutes minimum, re-apply after 30 minutes minimum. Do not overcoat with other coatings until fully dry. Clean brushes and equipment in methylated spirits.
Patent Knotting solution is available in 500ml sizes only.
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