How to fix knot bleeding
Knot bleeding is brownish spotting through a paint or opaque stain where there is a knot in the wood of the wall or trim. It can be unsightly and should be repaired before it affects the look of the room it is in. Here is how to fix knot bleeding.
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Causes Of Knot Bleeding
Causes Of Knot Bleeding
This problem usually affects woods with knots containing resin (pine, spruce and fir). Solvents in coatings dissolve resin. During the drying process, solvents evaporate through the paint film giving it a brownish colouration. Knot bleeding is not the same as resinous exudation which occurs under heat or sun. In such case, the resin oozes through the coating giving it a yellowish colouration after a few months.
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Solutions For Knot Bleeding
Solutions For Knot Bleeding
Seal bare wood knots with a shellac. Apply a solvent-based primer-sealer, such as GoPrime 200-135 and a new coat of opaque coating. Resinous exudation cannot be stopped. It ceases only after the knots contain no more sap. Remove resin by heating knots and scraping off excess resin. Then remove any residues with wood alcohol. Do not apply shellac on knots before applying a transparent or semi-transparent coating.
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