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Painting and Staining
Flooring

Can you put an oil based polyurethane over the top of water-borne polyurethane?

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2012-03-07 02:24:13
2012-03-07 02:24:13

Yes, but the older finish must be completely dry before applying the new oil based top coat.

For furniture use fine steel wool to remove the glossy surface from the old finish to ensure proper adhesion between the two, oil and water based polyurethane. For hardwood floors it would be advisable to "screen" the floor with a buffer using 100 or 150 grit screens. You can rent a buffer for the short time it takes to screen a floor for around $40.00. Without roughing up the old poly the new poly will not have anything to grip and will begin to peel in a short time.

After you have vacuumed up the dust created by the screening process (for floors) wipe down the floors or furniture using mineral spirits or a solvent like denatured alcohol to clean the surface before you apply the finish. Use caution as both of these cleaning chemicals are extremely flammable.

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