Sorry to be a spoil sport BUT, you are all forgeting that the glue used to join the hyperlon is only good in certain parameters of heat / cold. I would suggest telephoning Chris or David at Henshaws for a diffinitive answer to this one. For referance we are concerned that now Spirit is land locked in Newfoundland the glue might not stand the extreme cold. As far as heat goes, how do you open up a seam on a hyperlon tube? you use a heat gun to melt the glue.
Sometimes, RIB's are not the best boat to be used in the triopics but as I suggested, contact Chris. Alan P