OK, after four pages of posts the answer is clear as mud.
Actually, a lot of good information and I think several possible options. Here's my summary of what I see so far. Please add, subtract, comment or add suggestions to this list.
1. Hypalon Adhesive
. PolyOne, Weaver, 3M, Bostik and a couple of others.
- Formulated for Hypalon and have excellent adhesion
- Easy application, essentially contact adhesives so no clamping or holding in place for along cure time.
- Will not stick to PVC or in general any other polymer like PE, PP but Weaver tech support offers a solution. Use their PVC adhesive first on the PVC components then coat Hypalon adhesive on top of that to bond to the dinghy
- Shelf life. Make sure to get fresh product.
- Available locally
- Differing opinions on whether or not it will hold and last. I tend to think it would work very well.
- Application requires clamping or some way to hold the parts
in place for a long cure time
- Messy to apply. Mask everything in reach.
- Once it's on, it's on. Screw up the job and you will have to live with it.
- Claims to work on polymers as well as Hypalon
- Data sheet shows several solvents that should dissolve the bond so if you make a mistake it isn't permanent.
- New product so less of a track record
4. MarineTex Flex Flex Set
- This product is new to me but MarineTex is a brand I know and like very well.
- Easy prep. Only need to remove any loose, peeling or soft spots of the old adhesive. Any areas where the old adhesive is hard, dry and well bonded to the Hypalon are OK as is.
- Claimed to bond well to Hypalon, PVC, PE or PP (PE or PP require a heat treating step).
- Not sure if it is removable.
- There is some bonding time the requires holding the parts
together but minimal.