Ordered some neoprene foam self adhesive strip from Camthorne Industrial Supplies via Ebay. Plus some spray adhesive. Last time I had some of this it was hardly sticky at all. Will see what turns up. Thanks for your suggestion.
I meant that the self adhesive strip was not very sticky last time I had some (for the engine cover).Sometimes the self adhesive isn't very sticky at low temperatures. I usually warm the foam, and the surface to be stuck to with a hot air gun. Or leave the van in the baking summer sun for a while before sticking!
Or did you mean that the spray adhesive wasn't sticky?