Tom
try 5200 marine sealent, its made by 3M, It is by far the best stuff around, (cures underwater) its flexable, I use it for so may applications, I even use to keep water from getting behind welds, only bad thing is its soo damn sticky it a pain to get it off the skin
Cheers
ML

98 wrangler 2.5l 3 inch rustys, 2 inch body, 33X12.5 MTR's DETROIT LOCKER, 4.88 gears, moser axles, Dana 44 (rubicon housing)