east coast, it looks like jamestown distributors carries it, I'd have to order and ship -- and yes prep always helps luckily this won't be structural, and I'll do a light sand/acetone before applying
which plexus product do you use?
it looks like the hysol might be a little more economical, but time savings/better product have their own benefits!
MA300. For cleats on a glass boat I like to use fiberglass U bar, it's quite cheap and easy to work with. I kerf the vertical sides on a table saw with a thin kerf carbide abrasive blade and a crosscut sled to make it bendy and bond it in place with Plexus. Works great, no wood involved. Make sure you wear a respirator, it's nasty stuff.
This technique works great with no prep because Plexus is designed to "weld" together two fiberglass surfaces by re-liquefying them for a chemical bond. So aside from the obvious benefits of having no wood under the paneling to rot, you also get a much better bond. The glass will delam before the bond fails.
I'm sure you can find fiberglass angle stock for much less if you search. I know we don't pay nearly that much, but we make large orders from industrial suppliers.