Marine Outdoor Green No. 256
The Mask: A treated tape with a clean, sharp edge and strong adhesion. Good for boot stripes, brightwork finishing and coating, and bottom painting. Removal time is five days and roll length is 60 yards.
The Release: Strong adhesion means don’t leave it on for longer than five days or it could mar your boat’s finish.
$29.99 for 3/4-inch-wide roll; westmarine.com