Just a follow up to the Butyl question. Yesterday I began removing my Beckson port lights to replace them with stainless ports. These ports were OEM installed, and of the eight, only one leaked. Each and every one of these ports was installed with butyl and only one of them had leaked in 29 years!
My new port lights will go back in with butyl and a little Sikaflex around the UV exposed edge and a bevel around the ports opening for capture of the butyl that will be better than factory!!
P.S. The gray colored butyl was easy to break free and still just as sticky as the day they were installed! I removed four port lights yesterday in an hour and a half and that included cleaning the surface and prepping them for the new ones.. That would have NEVER happened with Silicone or polyurethane...
This is the first time I've come across 30 year old butyl and to say the least I was VERY, VERY impressed that it's characteristics remained virtually unchanged!! Polyurethane at 30 years retains very little of it's original elasticity...
-Maine Sail / CS-36T
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Last edited by Maine Sail; 04-18-2008 at 09:57 AM.