Originally Posted by BogMonster
How easy/difficult is it to repair this "Strongan Duotex" fabric they are built of in the event of a minor repair being required?
Stephen, do a search on glueing PVC. It's all here on RIBNET somewhere.
It's very similar in process to glueing hypalon but the glue works by a different mechanism and it is not necessary to roughen the surface. Additionally, the adhesive is left to dry but, unlike hypalon adhesive, it does not then stick well. A light brushing of MEK is wiped over the glue and the surfaces are brought together immediately. So you advance along the glue seam, bit by bit, wiping before you. MEK is used for the surface preparation too and it's essential for the best joint. Acetone or thinners doesn't do the job properly. It's not used as a degreaser as I've heard someone say, it is part of the glueing process.
I've also used a method where the surfaces are brought together while the adhesive is still damp but it's a hassle because the surfaces you are dealing with are sticky.
Some folk feel this method is more difficult than hypalon glueing but I reckon not although the joint is immediate and very powerful. However, though not at all desirable, if you absolutely must, a badly aligned joint can be reopened by flushing MEK into the joint area and gently pulling the surfaces apart while continually flushing.
As you found when glueing your cone, it is essential to keep the hypalon adhesive surfaces away from each other else they stick but using the above method it's not so critical and I'm sure you can see the advantage of wiping only 50mm at a time and then pressing it together.
I wouldn't shy away from PVC, it makes a very sturdy, rigid tube because it doesn't have the stretch of hypalon but it does cut more easily and things like barnacles can take a wee strip out if you slide along them. As for deterioration, I had a 5mtr PVC inflatable for a few years and the material looked the same when I sold it as it did when I bought it new....but I don't live in the Falklands.
I've also got a PVC tender which is 6 years old and fine but it lives under cover so perhaps that doesn't count.