They don't usually go away. You'll need another coat of paint and be sure to use even pressure and feather in those roller marks.
What Are Roller Marks, Brush Marks and Paint Stippling? This happens when the paint coating fails to dry to a smooth film. You might be seeing unsightly brush and roller marks, or other unintentional textured patterns left in the paint by the roller.
A second coat of paint can help cover roller marks, especially if the first coat was applied unevenly or if the paint is thick enough to fill in imperfections. Here are some tips to ensure better coverage:
After a long painting project, you probably won't want to repaint anytime soon. Fortunately, you can remove roller marks by using a wet sponge and some sandpaper.
Patchy paint can result if paint has been applied unevenly. Patchy paint can be down to a variation in surface absorption. Walls might appear patchy if they have variation in texture. Using paint that is not fully mixed can cause a patchy appearance.
Make sure the paint is completely dry. Once it has dried, take a smooth piece of sandpaper and sand* paint down slightly until the surface is smooth. Repaint the surface and maintain a wet edge on your roller at all times. Move slowly, and don't be afraid to use more paint.
Fine Grit Sandpaper (120-150 grit): Essential for smoothing out any roller marks or uneven edges before applying the next coat of paint. Sand lightly to avoid damaging the wall surface.
The second (or third) coat of paint on the “oops” areas will even out marks and leave you with a flat, even finish.
Brush marks are caused by strokes that leave the paint with a rough texture and visible brush strokes. The rough texture and visible brush strokes can be easily covered in a second coat of paint by using a slightly different technique than you used for your first coat.
Solution. Use the proper roller cover (avoid too long a nap for the paint and the substrate) and ensure adequate film thickness and uniformity. High quality paints also tend to roll on more evenly due to their higher solids content and levelling properties.
Why it happens: Uneven or blotchy paint occurs when you've either skipped priming or not adequately primed your wall before painting. This can also result from not applying enough coats of paint to get a uniform finish.
If you've ever painted a room, you're probably familiar with roller marks. These are the unsightly streaks and smudges that often appear on the walls after painting. Roller marks are caused by the paint roller leaving behind streaks of paint on the wall.
Not Fully Loading the Roller
The roller needs to be fully loaded with paint to the core, otherwise you'll get air bubbles on your wall, resulting in “paint acne.” To avoid this mistake, roll back and forth on the roller tray until all bubbles are gone and the roller feels heavy.
Unfortunately, roller marks will probably not go away when the paint dries out. However, as the paint dries some of the roller marks will become slightly less noticeable. But simply waiting until the paint has dried won't solve the problem completely.
The best way to remove roller marks is to take a low grit sandpaper and rub down the roller lines lightly.
Use fine grit sandpaper to even out roller marks. Wipe the surface down after you've finished with the sandpaper. Then paint over the streaks lightly.
Weathered Surfaces: If the existing paint is weathered, faded, or peeling, applying two coats is generally recommended to ensure proper coverage, adhesion, and protection against moisture and UV damage.
Dip your roller lightly into the paint. It should cover less than half of the roller. Roll it back and forth on the ramp to distribute it evenly; this is how to stop patchy paint when using a roller.
Reapply another coat to fill in bare spots. If there are clumps or bubbles on the painted surface, sand it, wipe clean, and reapply a coat of paint. To avoid streaks or lap marks from a roller, maintain a wet edge by applying paint toward the unpainted area and then back into the just painted area.
Consequences: Applying a second coat too soon can lead to peeling, streaking, and uneven colour distribution. Solution: Always follow the recommended recoat times and test a small area if you're unsure.