worst place for a puncture Tom right on the seam and a lot of work to do properly. and if its a cheap SIB i would be inclined to do a repair from externally injecting aquasure or similar you can by it in small tubes like superglue size, i would have the hole facing down inject the aquasure then tape over the hole to stop it dripping out leave for 48 hours peel off the tape and pump up. others will differ but thats what i would on my current boat if i had the same. you can clean it up if it works and put an external patch for added strength.
ha you keep beating me david what is the stuff you found that makes a very good repair?