jiju1943, everyone always yells "get it welded" when anything comes up on a pontoon, and with respect to cracks I agree as its the only way to stop any prorogation and restore structural integrity to the area, but that said, things like pin holes and drains can be safely and easily addressed less having to chase down a welder. About 4 years ago, I purchased a Sun Tracker Pontoon from a guy over in Hilton Head that used it in saltwater and over time the toons developed a few small pin holes via electrolysis. I cleaned and sealed the pin holes ( just the ones dripping water) using Lock Tight Marine Epoxy (formulated for below water line use). Purchased from Lowes Home Improvement for around $5 a tube. I cleaned the pin holes using a wire brush and applied the epoxy per the instructions, it never leaked again. That was just under 4 years ago. As for removing the water from the toons, I purchased two 1/2 diameter snap plugs from Bass Pro for $4 and drilled a hole 1/2 above the weld seam on the rear of each toon and once the water escaped, I adjusted the snap plugs to tightly cam over and sealed the holes. No welding, no leaks. Again all this occurred nearly four years ago and the toons have never taken on any water since. And before the na sayers, chime in, my pontoon has been wet moored to my boat dock (Lake Sinclair, Milledgeville, Ga) with only an annual pull out for cleaning to remove excessive algae, etc.