I'd suggest a good angled brush and practice. Don't put too much paint on
the brush, and take it in long strokes, easing into the final line you want
to leave. It's not hard, but it does take some practice.
If you don't press the painter's tape down firmly, paint will get under
it and make a "fuzzy" edge. Be sure to press the tape hard, and don't
brush across the edge (paint with the edge). Take tape off right away -
if left till paint dries, it will either stick to the paint on the wall
or drag off little chunks of paint.
Trick from a graphic art teacher a few years back -- spray clear
shellac or lacquer over the tape before actually painting. If
the tape leaks under the edges, it'll be the invisible shellac
that bleeds under, not the paint.
Best though to practice and learn to cut in by hand, considering
how much prep work it'll save you.
I agree with the other posters that practice and freehand is
However, this weekend I had a tough line to follow on some touch-up
and didn't want to take out and clean my good brushes.
So, I stumbled on this trick that worked great...
I used a small foam brush (maybe 1/2-1" wide) and an old hotel key
card (same size/thickness as a credit card).
I used the key card as a mini-edger and held the foam brush up close
to it. Then I moved the two of them in parallel with the key card
flush to the perpendicular wall edge. This made for a nice straight
line and no clean up (just threw out the foam brush and key card).
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