Preventing Bubbles In Urethane Floor Vinish

When the finish hardens you have to sand them out and apply a new finish.

Preventing bubbles in urethane floor vinish.

Some brands of finish are known to bubble more than other brands. Stir the contents instead with a paint stick in a gentle swirling motion. Stain that has not dried before the first coat of finish can cause bubbles. 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.

Brush out bubbles in a fresh polyurethane finish. Diluting the poly. Heavy coats of paint levels as it dries flattens out to hide brush marks and minor defects. Nobody wants to do all the work of refinishing and end up with bubbles in the finish.

Applying polyurethane and most other finishes in heavy coats creates bubbles puddles and runs and becomes a defect in and of itself. The stain may feel dry on the surface but still be wet below the surface causing the finish to bubble. Resist the temptation to shake the polyurethane prior to use. I had tried every option i could think of.

To prevent air bubbles from occurring at all follow these tips. This happens to floor finishers who drag the finish applicator aggressively and then must stay off the floor until the finish dries. There are several things that can cause bubbles in the finish. However if you re not careful small air bubbles can mar the beauty of the finish permanently.

I had similar problems with very fine bubbles in topcoat. By the way water. I was applying semi gloss finish polyurethane on an oil stained birch tabletop. Stir the can prior to use and take your time.

Very smooth surface preparation.