Preventing Bubbles In Urethane Floor Vinish

There are several things that can cause bubbles in the finish.

Preventing bubbles in urethane floor vinish.

However if you re not careful small air bubbles can mar the beauty of the finish permanently. Stir the contents instead with a paint stick in a gentle swirling motion. Finish brushes delicately lay on a thin clear coat to accentuate the surface below. I had similar problems with very fine bubbles in topcoat.

Diluting the poly. The most common causes for bubbles are shaking the can and improper brush prep you don t stick a brush into the finish without first soaking the bristles in mineral spirits for oil based polys or in water for water based polys. The only remedy is to sand out the bubbles and apply another coat of finish more. Applying polyurethane and most other finishes in heavy coats creates bubbles puddles and runs and becomes a defect in and of itself.

Brush out bubbles in a fresh polyurethane finish. Nobody wants to do all the work of refinishing and end up with bubbles in the finish. Resist the temptation to shake the polyurethane prior to use. Very smooth surface preparation.

When the finish hardens you have to sand them out and apply a new finish. The stain may feel dry on the surface but still be wet below the surface causing the finish to bubble. Stain that has not dried before the first coat of finish can cause bubbles. Sanding between coats with very fine grit paper 220 and finer.

Stir the can prior to use and take your time. To prevent air bubbles from occurring at all follow these tips. I was applying semi gloss finish polyurethane on an oil stained birch tabletop. Some brands of finish are known to bubble more than other brands.

I had tried every option i could think of.