Your boat certainly could weigh 160 if the foam is saturated. You have to be careful to not lean on it or support it, which throws the weight off.
Alan sells Sunfish down by Syracuse, and usually has a line on one or two of them. Sometimes he comes across Minis.
All of those chipped areas could allow water inside the hull. The chip is where the polyester resin has flaked off, the resin keeps water from getting to the fiberglass cloth. The cloth has a little bit of resin in it as well, and resists water permeation, but not for long. There also could be micro cracks or fractures in the fiberglass cloth that let water in. Once water comes in it could easily fill up the pontoon hull. A Mini is supposed to weigh 75 pounds, so you potentially have 85 extra pounds of water trapped in the foam. At 8.34 pounds/gallon, there is about 10 gallons of water hiding in there somewhere.
Alan sells Sunfish down by Syracuse, and usually has a line on one or two of them. Sometimes he comes across Minis.
All of those chipped areas could allow water inside the hull. The chip is where the polyester resin has flaked off, the resin keeps water from getting to the fiberglass cloth. The cloth has a little bit of resin in it as well, and resists water permeation, but not for long. There also could be micro cracks or fractures in the fiberglass cloth that let water in. Once water comes in it could easily fill up the pontoon hull. A Mini is supposed to weigh 75 pounds, so you potentially have 85 extra pounds of water trapped in the foam. At 8.34 pounds/gallon, there is about 10 gallons of water hiding in there somewhere.