> > I have a weep in a fiberglass diesel tank on my sailboat. , we're > convinced that the leak is where the > top is joined to the sides. John, See my web page for how I did it. I think it is under Repairs You can use SPLASH ZONE on the fiberglass. Read my article and then get back to me. I ll ans any ques you have. It is stiff and will not sag. as fiberglass would if applied from the inside of the tank Determine where the leak is and type of access to it. If there is no access around the leak it is very very easy to cut a large access hole in the side of the tank . I did this on my steel tank. Use an alum plate to seal the new access hole. In fact while you are on my site look at the picture of the "Belt Guard" in the background is a fuel tank that I cut the hole in for access. Look closely thru the factory access hole , the little round one , and see the welder INSIDE the tank!!!! CCC P.S Happy MARDI GRAS everyone. Charles C. Jr., and Pat Culotta M/V CCRIDER Patterson, La. http://www.geocities.com/charlesculotta >

Hello, all, I have a weep in a fiberglass diesel tank on my sailboat. The tank is heavily-built and foamed in place inside the keel. After consulting with the folks who built the boat, we're convinced that the leak is where the top is joined to the sides. To remove the tank, or to get to the entire periphery on the outside, involves extensive removal of the sole planking and framing and galley furniture; I'd rather stuff a flexible tank in than do that, but I'm just not ready for that option. It occurs to me that suitable fix might be to simply gun some Permatex-type material onto the inside of the joint. I have used Marine-Tex and other epoxies for other fiberglass fuel tank repairs, but feel I need a something different for this- a gooey, fuel-proof sealant that won't sag. A related problem is that due to the limited access, I won't be able to do much more than feel my way around the seam with my fingers while applying and there's no good way to see. It was suggested to me that I might try "sloshing compounds" that are used to seal thin fiberglass fuel tanks on home-brew aircraft, but there were too many horror stories of plugged filters for my liking! Suggstions solicited. John "Seahorse"