I found some epoxy "putty" at a marine store that was perfect for a number of holes. You just cut a length of it, knead it in your hands and putty-up the holes. It's gray, like aluminum and cures rock-hard. They say it can even be drilled and tapped. Also, spray can expanding insulation foam can be useful. I had some special dark gray stuff left over from a water feature project that could be sprayed in and then trimmed off with a knife to a neat surface. Some of my holes I ended up cutting aluminum pieces and epoxying or riveting them down. Small holes respond well to silicone rubber from a tube. Last but not least, the Second Skin insulation with it's gooey butyl backing/adhesive pretty much sealed up everything else. In fact, I think she'd probably hold water now. Hope this helps.
I used a silver/gray silicon adhesive for the larger gaps between panels, and once it was dry, I covered every seam in the cockpit with aluminum HVAC tape. Then heat insulation, then carpet. Solid as a rock.
I have some of the aluminum HVAC tape. I think it would stick to a pool of oil....great stuff. It's actually thin aluminum with a pressure sensitive adhesive. I got mine at the local Home Depot. Most plumbing supply houses should carry it also.
try lowe's for the aluminum tape. there are 2 kinds - on that is listed (has writing on it) for using on duct board, metal duct work, etc. about 2 1/2" wide, about 15.00 a roll. then there is a unlisted kind (no writing), about 1 1/2" wide, about 8.00 a roll. good stuff, will stick to about anything!
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