Hi: My first post ... I have to replace an old fuel sender in my Newport 27 diesel tank. The original had what appears to be a leather gasket, and it leaked every time the boat was heeled.... the main filler and fuel line/returns are in good shape. I have a new Moeler unit along with it's gasket. My tank is the plastic variety. The original mounting holes in the tank are stripped, but I might get away with using a wider screw with a coarser thread. I'd like to use an adhesive sealant in addition to (or instead of?) the rubber gasket. My fear for the rubber gasket alone is that I may NOT be able to tighten up the screws sufficiently to get a bombproof seal without restripping the holes in the flimsy plastic. I have plenty 3M 5200 on hand, and it is supposed to be diesel resistant, but what would you recommend? Once done, I never want to visit this assembly again!! Your ideas on prepping the plastic tank for adhesion are also appreciated. Thanks RON W