Sikaflex(made by Sikkens) is a polyurethane adhesive sealant, comes in several variations. From reading posts,think 3M 5200, but I`m not sure. They make a silicone too, it`s good. And Cetol too. If you can use silicone you could probably use Sikaflex, without the "no paint" drawback, but if you need to remove it, eg failed experiment,silicone would be easier than Sikaflex, and it`s less messy to use,I usually tape up when using Sikaflex.
2005 Integrity 386 "Sojourn"