Whoa. Do you see a difference between the left line and the right line?? The right side was done with the Blue Painters tape and the left was done with the Green Frog tape.
I had no idea that there was a difference in the type of painters tape used! Why have I been using blue tape my whole life???
The trick was to scrape down the edge of the Green tape onto your surface. Paint or stain the line (I used a rag), and then pulling the tape off right away but slowly!