HH-66 is an excellent product for bonding vinyl fabrics, in fact most fabrics, but especially good with vinyls. It would be a superb product for doing your repairs. I really believe that there is no better product available.
I have been using HH-66 for repairing Marquee fabrics (which are identical to lorry side curtains) for over 10 years as I have never found a product that even comes close to being as good. This year we started importing HH-66 from the manufacturer in the USA ourselves as it’s virtually impossible to source in the UK. However we have to take a bulk shipment which is more than we require so I decided to sell it online to recoup some costs.
With regard to HH-66, there is no preparation needed at all. It bonds fabrics in the same way as heat sealing. It is a contact adhesive and needs to be applied to both surfaces. If you apply it to one surface first and then let it go off, then apply to the other surface and bond, the seal is virtually permanent.
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Dont know what is meant by the last two words