Sounds like you're looking for something to do the work. You don't say where the 52 is but heat can make the work much easier. I've never removed 52 but I've read it softens w heat.
I use Dolphinite whenever I need a sealer that is not an adhesive. Why use glue (5200) to bed a cleat? Two or four bolts hopefully w backing plates holds the cleat on. Products that have been around seemingly forever are often better than the latest new fad.
North Western Washington State USA