How do you prevent roller marks when painting?
To avoid making marks on the ceiling with your roller, reduce the amount of paint you use. If you notice roller marks appearing, re-roll the areas to smooth them out using very light pressure. Another method to avoid roller marks is to add another coat of paint in the opposite direction for the second coat of paint.
Roller marks are caused by the paint roller leaving behind streaks of paint on the wall. This can be due to several factors, such as using the wrong type of roller for the surface you're painting, using too much paint or rolling in one direction instead of back and forth.
Fortunately, you can remove roller marks by using a wet sponge and some sandpaper. Once your paint has dried off, rub down the surface using your sandpaper. Be sure not to get rid of too much of the paint because the only goal is to even out the coating.
Fortunately, just as you do with your walls, you can get rid of roller marks on the ceiling by applying another coat of paint or using a fine grit sandpaper to knock down the ridges.
If your paint isn't rolling on as smoothly as you want, you can stir in a little water or Floetrol. (Use Penetrol instead if you are using an oil-based paint.) This will help thin the paint so that it levels more easily, eliminating brush strokes and roller marks.
Dip the roller lightly into the paint, the paint should cover less than half of the roller. Then roll it backward and forwards on the ramp of the tray to evenly distribute the paint on the roller cover. Roll the paint onto the surface in a large zigzag pattern. Then fill in the space with criss-cross strokes.
Before you start a paint job, you actually want to wet the paint roller cover with water. “This primes the roller cover to soak up as much paint as possible,” Barr explains. But don't go too crazy—Barr suggests removing excess moisture with a paper towel and a good shake of the roller so it's just slightly damp.
The best paint brush for a smooth finish is the Purdy Nylox Glide brush. It has super soft bristles that do not leave brush marks. It's perfect to use with latex paint. Projects that are perfect for this paint brush include painting cabinets, trim, furniture and doors.
In between paint coats or short breaks, avoid washing your roller/brush, instead, wrap it with cling wrap to keep it fresh.
Paint rollers should be washed after every use. There is an exception to the rule, though. If you're taking a break and job isn't finished, then you don't need to wash the paint roller right away.
Are you supposed to wash and reuse paint rollers?
You can reuse it without affecting the quality of the paint application and over time it will end up paying for itself. Reuse your rollers with these 3 simple steps: Scrape the roller after use but do not let it dry out. Create an airtight cover with plastic wrap or a plastic bag—keeping it moist is key.
Semi-gloss and gloss paints reflect light, giving them a bright, shiny finish. While semi-gloss and gloss paints require more prep work and sanding than their matter counterparts to ensure a smooth application, paints with a glossy finish can be scrubbed once dry and are easy to clean.

Don't press too hard on the roller, as the fibers of the roller cover will get matted—let the paint do most of the work. Pressing too hard will also make your paint thick at the edges of the stroke. If you're using a paint roller with an extended handle, stop a few inches from the ceiling.
Don't press too hard on the roller or move it too quickly across the ceiling, as these actions are likely to cause the paint to splatter. Instead, use slow, steady strokes to apply the paint to the ceiling. Apply the paint in straight lines, rather than allowing the roller to zig-zag around in a random pattern.
Roll the paint onto the surface in a large zigzag pattern. Then fill in the space with criss-cross strokes. Once you've covered the area, level the finish by laying off with long, parallel strokes. Laying off needs to be done before the paint has commenced drying, so it's best to work in sections at a time.
Spin the roller six or seven times to evenly distribute the paint onto the roller. Roll the paint onto your surface in straight swaths. Once you run out of paint on your roller, go over the sections you've just painted, again in straight lines, to smooth it and remove excess paint. Repeat.
Before you start a paint job, you actually want to wet the paint roller cover with water. “This primes the roller cover to soak up as much paint as possible,” Barr explains. But don't go too crazy—Barr suggests removing excess moisture with a paper towel and a good shake of the roller so it's just slightly damp.
For painting wall edges, it is best to paint the edges first, then paint the rest of the wall surface with a paint roller. There are two ways to paint wall edges near the ceiling. You can either use a paint edger device or use a good-quality angled paintbrush.
Any dirt, dust, or grease will create streaks in the paint. To clean the wall, simply wipe it down with a damp cloth. Use a high-quality paintbrush, roller, or foam brush: A good brush or roller will help to evenly distribute the paint and prevent streaking. When painting, use long, even strokes in one direction.
The nap is the thickness of the roller cover. Different thicknesses work better on different surface types. The main rule of thumb is thicker naps for rougher surfaces. Thicker naps hold more paint, helping get it into nooks and crannies.