said by printscreen:I have been using this for many years to paint where two walls with different color meet or between top of the wall and ceiling. Works also where floor and wall meet. Works nicely altough tricky to get into corners where three surfaces meet. Cheap and effective.
»www.homedepot.com/p/Shur ··· 00070177
+1, I recently used one of these, it worked perfect, left a clean edge, and was quick.
