would it not be safer to locate the source of the leak ? i have a kysosho seawind that took on water when i first got her , traced my leak to the original hatch bending & letting water in , solved my problem with some 5mm clear prespex , 5 x 40mm x m4 stainless steel nuts & bolts 7 5 m4 wing nuts and a length of 6mm half round neopreen rubber , ive made my own hatch and cured the leak !