I have used One Shot brand lettering enamel for this with good results.
Mfg'd by Consumers Paint in Chicago and distributed where graphic art
supplies are sold. Ask your local sign shop. Hard to find because it
contains lead. Extremely durable, fade resistant, covers in one coat.

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...