I am considering purchasing a used wide transom 15 foot Sportspal or Radison canoe. Many ads say "no leaks" or "I coat the bottom every year with xxxxx". Are these canoes prone to leakage? Also the Sportspal dealer tells me the difference between the two is that one is riveted the other welded. Supposedly the riveted (Sportspal) is better. Can anyone shed some light on this?