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Old 28-05-2013, 12:10   #1
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Join Date: May 2009
Location: St. Augustine, Fl
Boat: Gulfstar 37 sloop
Posts: 51
Fiberglass diesel tank sealant

Hi all,

I never completely filled my integral fuel tank after a repair that involved cleaning the tank by removing the site gauge (located on top of the tank) and working thru the roughly 4 inch diameter hole. The guy that cleaned it out cut a black rubber gasket, screwed the site gauge/coverplate back down and called it done. I filled my tank and discovered that this is not a tight fit. Diesel on top of the tank. So like most jobs on boats, its better handled by me the owner who will do it properly. My only question is what materials I should use to seal the cover plate with. Rubber gasket material and a compatable sealant of some kind that diesel will not affect? The top of the tank is not a smooth fiberglass surface nor very true. Its also painted with bilge coat. Suggestions?
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Old 28-05-2013, 12:48   #2
Guy
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Join Date: Feb 2013
Location: Boat is on the Rio Dulce
Boat: Seafarer36c
Posts: 3,584
Re: Fiberglass diesel tank sealant

Well you have to get rid of the bilge cote first then you need some 2 part Poly Sulfide sealant. Wax the gasket on the sender side (so you can get apart again sometime) and glue it together.
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