Polyurethane, whether it’s an outdoor or indoor formula, takes a little finesse to apply without bubbles or brush strokes. By Sal Marino. Water based finishes can be a little tricky to apply. It … When I do this, even when I sand very lightly, like one low pressure pass with 400 or 600 or even 1000, the texture comes out nice and smooth but the polyurethane is always scuffed with little white marks. Note: I prefer to use 6-in. The truth is there’s no magic going on with the pros. Use a Roller on Large, Flat Surfaces. You need to use the right brush and it takes a little practice to get the technique right. No brushstrokes, puddles or thin spots. Sponge brushes are certainly another option, but the results are not always a significant improvement. Quick Tip! rollers lets you apply the poly fast and evenly. Wipe the entire floor with a tack cloth to remove any dust from the sanding process. Always apply thin coats. Do not use a brush when applying polyurethane unless you must for corners and edges. This means only touch wet paint that you’ve just painted. as you work, shine a light at a low angle across the surface. Apply the next layer of polyurethane with a foam or lamb's wool applicator. Brush on three thin coats with a foam brush. To reveal flaws (bubbles, brush marks, etc.) “Tip off” each section. They just use the tricks of the trade. Forms a thicker coat, so the finish builds up fastest. How to Apply Polycrylic without Streaks, Brush Strokes or Bubbles How to Avoid Brush Strokes and Streaks. There’s always a bit of leftover lint, but only on the first coat. Forms a thicker coat, so the finish builds up fastest. Allow that coat to dry for 20 minutes or so before applying another even layer of Mod Podge in up-and-down strokes. Test before you sand. Once you're done, It wont look great, (lots of brush, sponge, cloth marks and bubbles) don't worry, the polyurethane shrinks as it dries so it will look better. Maybe a brush mark here and there, or a couple little nibs, etc. Covered below, we open up the book on how to avoid brush marks and also see if you can fix brush marks … A 6-in. microfiber rollers dampened with mineral spirits. Keep a wet edge. Thinning the polyurethane makes it flow on more smoothly and reduces brush marks. Touching paint that has sat for even a few minutes can cause streaks. Using either a paint brush, a foam brush/pad or a soft lint free cloth/rag (best in my experience), give the surface its first layer of water based polyurethane. To minimize brush marks and bubbles, “tip off” each section of your project at a 45-degree angle and lightly run the bristles over the entire length of the wood. Why Do I Get Bubbles and Brush Marks In My Varnish and Polyurethane? (You can use a natural bristle brush with oil-based poly, but keep an eye out for loose brush hairs.) Brush-on Great for broad, flat, horizontal surfaces—floors, tabletops, chair seats. Polyurethane coatings brushed on vertical or contoured surfaces are more likely to drip and run. When brushing on the finish, make sure to load the brush enough so you can apply a liberal amount of finish without having to press down on the brush to get more out. The advice I see often is to sand the area lightly with a high grit sand paper. I have found that this process results in the smoothest possible finished surface. They dry fast which means you have to apply them fast. Thick coats take longer to dry and are more likely to be uneven and attract dust. Knowledge + technique + a little experience goes a long way to getting your professional painting look. When applying Mod Podge over a design, apply one layer of the Mod Podge with side-to-side brush strokes. 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