You have two ways to eliminate them. Try sanding first to see if that will work. Use 80-grit, non-clog sandpaper on either a sanding pole or a sanding block (Photo 1). Use a “clog resistant” type, such as 3M Sandblaster sandpaper, or wipe the sandpaper often with a stiff brush to keep it from clogging up.
The main reason you get paintbrush marks in the first place is because the paint hasn't flowed out completely before it's dried. So, the first tip in avoiding paintbrush lines is to buy slow-drying paint. This is usually higher quality paint that is labeled to take up to 24-hours to dry.
If you see the brush fibres starting to fan out, this indicates that you are pressing too hard on it. Wet your brush with water before painting. This will let the paint not dry out fast in the bristles and pre-soften them. Going back over semi dry paint is never a good idea.
16 Ways to Avoid Brushstrokes in Your Acrylic Painting
- #1: Start with a smooth surface.
- #2: Use a soft brush.
- #3: Use opaque paint.
- #4: Paint in thin layers.
- #5: Try fluid acrylics.
- #6: Use a flow improver.
- #7: Use water to thin your acrylic paint.
- #8: Make sure your brush is fully loaded.
preventing you from rolling up close to the edges. Instead, before you dip your roller in the paint, slide the brush cover off the roller frame, 1-2 inches should do the trick. Now when you roll, the brush cover can roll right up against and over your brush strokes from where you had cut in previously.
For uneven brush marks, you'll want to apply another coat of paint until you can no longer see them. Try to avoid painting in the same places so the edges don't become more noticeable.
More often than not, roller marks occur when you fail to load your roller with enough paint, or have exhausted the paint in your roller and are trying to cover more area than you should. Finally, applying the wrong amount of pressure can cause paint to push out around the edge of the roller, creating a streak.
As you may have gathered, the best way to paint interior walls is by using both a brush and a roller together. Use a brush to cut in your walls along the ceiling, edge of skirting board, corners, and to paint detail work or textured surfaces. An angled brush specifically designed for cutting in is ideal for this task.
Start at one end, running the roller up and down the full height of the wall, moving over slightly with each stroke. Move backward where necessary to even out thick spots or runs. Don't let the roller become nearly dry; reload it often so that it's always at least half loaded.
After the first coat is dry, lightly sand the entire surface with an ultra fine grit sanding block. Vacuum the dust off and clean the surface with a tack cloth. Paint the second coat of paint on the piece the same as the first. Repeat by sanding between coats of paint.
Sand with fine sandpaper between coats after they dry. Make sure you remove sanding residue before applying additional coats. I recommend three thin coats of paint, but it all depends on the color and consistency. After the final coat of flat paint, sand* lightly with super fine sandpaper.
Adding a Second Coat
After your first coat of paint is dry, it's safe to recoat typically after four to six hours. A good rule of thumb is to wait at least three hours to recoat your paint or primer if it's water-based. Waiting 24 hours is best for oil-based paint and primer.