I am trouble shooting (excessive?) water intake into Aluminum boat. My fiberglass's never took on this much water. I have filled inside and have located 6-8 loose rivets that have droplets coming off. No Streams of water pouring out. I have a long strip that appears to run from transom to bow, appears to be welded with rivets (keel?). May have small leakage there, although it appears the rivet leaks into this then drains. I run my 500 gph Bilge approx 1 1/2 min. every 45 mins. I have plugged all intake / output holes in boat and see no difference in intake. See no excessive intake from transom area or connections. Is this normal on an Aluminum? Would 6-8 rivets leak that much water under pressure? If not normal, would taking up my deck be my next step. Goal would be a 1 time fix..time / money aside, would rather do it properly. Will post pics. when my daughter can teach me how