| http://www.w3.org/ns/prov#value | - At that point, a polyurethane coating will not hurt the wood or the stain.If you plan on applying Penofin to an area that is already covered in polyurethane or other coating, it is necessary to strip off the coating and clean the wood with Penofin's 3-step cleaning system before applying Penofin Penetrating Oil.
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