Hey David! The product that removes 5200 is sold at West Marine (as well as many other places I'm sure). Its called Anti-bond (part numer 1174804 and sells for around 11.99) I've used it (on polyurethane) and it worked pretty good. It is says it cleans and debonds polurethane and "other" adhesives. One thing to note is that polyurethane sealer-adhesives are generally not compatible with ABS or lexan so I would bet that you aren't dealing with a polyurethane, but the antibond may still be able to remove whatever it is. I agree, if you try it, a test patch would be a good idea! Probably just said a bunch of stuff you already knew. Just like to hear myself talk I guess. :-)