If the hull has any flare, a tape of a constant width won't look right when
viewed from the side. In my last boat, the boot top had a constant vertical
dimension of 2" and varied up to about 8" on the hull.

Tony Abbott wrote:

What kind of paint or tape does one use to apply the waterline? I've used
the Interlux thus far and want to add a 4"-6" water line. Suggestions?

Thanks...