I painted all 4 walls a pretty blue and want to paint stripes on the back wall in swiss chocolate brown .....however, every time I have used the painters tape for edging, paint ALWAYS leaks through if I'm not very careful. What is the secret for painting these stripes and not having the paint leak under the tape? I want the stripes to be straight / crisp and perfect !! Since it's a dark stripe over a much lighter blue, it won't be so easy to touch up in paint gets under the tape. Thanks for your help !