I'm a tarp guy, over the boom and the jib pole for the foredeck. Tried jugs filled with water two years ago, didn't work. Now I tie lines completely under the hull, one side to the other and make sure the knots are all below the water line, that seems to be satisfactory. My tarps come over the lifelines and two years ago I used pipe insulation to prevent chafe and wear on the tarp. That didn't work so last year I used tennis balls. Just cut a slice in them so they fit over the stanchion and hold them in place with duct tape. Gotta love duct tape. When tieing the tarps I don't pull them overly taut, a little slack in the material keeps snow/ice from building up. Not that we have that much in Rock Hall.
All the best... and COME ON MARCH.
Catalina 387 #29
Rock Hall, MD