sikaflex is so bloody expensive, once opened it seems to go off in the tube overnight so no good when you want a blob.
i used pu18 to stick and caulk my teak deck 1.5 yrs ago and still looking good, and its only £3 a tube, so it doesent matter
if you only want a little bit. althou i found once opened it lasts about 4 days. http://www.ebay.co.uk/itm/181107513...eName=STRK:MEWAX:IT&_trksid=p3984.m1438.l2649
Sikaflex will not go off in the tube if you stick it in a freezer fairly soon after using it. I realise that this info is no use at all if you have to travel any distance to work on the boat and don't have a handy freezer on you. But its useful to know for projects in a garage. Or shed with a freezer.