Painting a Straight Line
Paint the first wall with the most dominant color, wrapping the paint well around the bullnose corner. Let it dry for at least 4 hours.
Lay a strip of blue painter's tape either straight down the center of the curve or to one side of the curve. Press it down carefully with your fingers to ensure a tight seal. Use a chalk line to ensure a perfectly straight line, but it's usually enough to "eyeball" it.
Paint your second color up to the tape with either a brush or roller. Avoid pushing the paint towards and under the tape. Two thin coats is better than one thick coat.
Wait at least another 4 hours before slowly and carefully removing the tape. If the tape was rubbed down carefully and the paint allowed to dry for at least 4 hours, it should be perfect. If there are any irregularities, fix them with an artist's brush.
Painting a Blended Line
Paint both walls to the corner, allowing the paint to meet up. It's not necessary to have the line perfectly straight.
Pour a little of each color into a large plate or roller tray. Working quickly, mix them together to get several shades and stipple them onto the corner with an artist's brush so they blend seamlessly.
Use a roller tool to blend the colors together very efficiently, following the product directions. (See Resources.)
Things You Will Need
- Blue painter's tape
- Paint brushes or roller
- Artist brush
- Blending tool
- Ask for "low-tack" blue tape if you're applying it over very fresh paint. It's less likely to pull the first paint color off the wall. Use at least 1 inch wide blue tape.
- Only use the blending method if the colors are different shades of a similar color, such as light tan and a darker brown. Doing this with complementary colors, such as red and blue, won't look right.
- Mixing a little faux glazing liquid with the paint retards drying time and makes it easier to blend them together smoothly.