My long smoked plexi glass windows on my O'day 30 CB are cracked and leaking. Nothing major, just enough to be very irritating. I think my local glass shop can provide me with the replacements if I supply him with a card board pattern. What is the best sealer to use. My last sealer was life caulk in black and was pretty useless. Also, apart from cleaning the cabin top and wiping the area with Acetone, is it a good idea to just scratch the surface area where sealant will be applied to help it bond? As always all responses are gratefully received.