Will polyurethane work over stained polyurethane? I have a board that is polyurethaned and I want to stain it (without sanding) and then put a coat of polyurethane over the stain.
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The Practical House Painting Guide
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You cannot stain over a wood finish that has any urethane coating on it… stain needs to be absorbed into the wood and this is not possible with natural (or even pre-stained) surfaces that have been treated with any coatings or even with wax…
Sanding might remove any coating but most likely it will give poor results… try a paint and varnish remover (follow label instructions) or better, try a furniture refinisher product… Good Luck!