Originally Posted by Paulmor07
Recently picked up this second hand zodiac futura mk2 and have been having a great time with it.
Only issue so far is that I've noticed a tiny pin prick leak on the seam of one of the speed tubes (stability tube under the boat, not the main pontoon). Keeps reasonable pressure for a while so is usable but it's an issue if like to sort out before t gets worse.
Have had a look online and called around local stores but it seems not many people in Melbourne know much about SIBs.
Does anyone know the best way to patch a leak like this on the speed tube? Right on the seem so sont think a normal patch will do. Was considering just dumping some silicon on it and hoping for the best but thought of ask around first!
Silicone sealant is icky! Sika or 3M 4000 / 4200 only for me...Silicone sealants contaminate the sealed area, making it impossible for future repairs to stick. Not to mention that it bonds poorly to PVC or Hypalon (peel strength probably measured in grams rather than kilograms!)
What you want to do is use a 2-part adhesive with a piece of PVC material. The speed tubes see a lot of wear, so I would probably do a 6" round patch. If the leak is on a curve, I would put a smear of Aquaseal on it first, let that cure, then patch it.
For reinstalling the speed tube, clean the holder out with soap & water, then spray the speed tube down with soapy water or 303 protectant. There might be a grommet on the front of the holder? I don't remember if the Futuras have a grommet...if they do, simply run some Paracord or similar high-strength string through it, then fish it to the speed tube, and yank her through. If it doesn't, you may want to push it in uninflated with a hockey stick or something.