Best answer
Wipe brushwith the side of polyurethanecan By wiping the brushalong the side of the polyurethanecan, air bubbles can trap inside the brushfibers. Then these air bubbles mix with polyurethanewhen applying, they got hard can cause permanent bubbles in a polyurethanefinish.
People also ask
How do you use a brush for polyurethane finish?
Foam brushes are inexpensive (and disposable) and work well for most flat surfaces. Bristle brushes are better for molded edges and fine details. Brush on the polyurethane so the brush strokes are parallel to the grain of the wood. Use a sufficient, but not overly thick, coat of finish.
How do you apply water-based polyurethane?
The basic application technique for water-based poly is similar to that for oil-based. Apply a very thin coat of polyurethane with a fine brush, foam pad, or cloth. Work with the grain, and avoid applying too much polyurethane to avoid raising the grain. The initial coat should be dry within a couple of hours, and you can then apply a second coat.
What happens if you put polyurethane on brushes?
If you use natural bristle brushes with water-based polyurethane, the brush鈥檚 bristles clump together and lose their shape, and they are more likely to leave brush marks behind. Before applying polyurethane onto your prepared surface, dampen your brush in a solvent to remove air bubbles caught between the bristles and in the ferrule.
How do you apply polyurethane to hardwood floors?
Apply a very thin coat of polyurethane with a fine brush, foam pad, or cloth. Work with the grain, and avoid applying too much polyurethane to avoid raising the grain. The initial coat should be dry within a couple of hours, and you can apply a second coat.