Evenin' Tuskar,
You need
MEK, and you need it badly. Any RIB repair outfit or liferaft repair shop will have some. Don't d1ck about with anything less - you'll regret it. I sort my rig with a supply from the lads in Killybegs but they won't be able to ship the stuff - it's nasty!
DO NOT let MEK near good seams on your SIB - the glue will give up the ghost!