SailNet Community - View Single Post - Re-bedding Windows: 3M-4200 v. Butyl Tape
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post #9 of Old 04-08-2011
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Sailordork, I'm going to try the butyl route on one portlight this weekend (if it doesn't rain). Never tried it before, but from my research it seems to be a viable option for sealing portlights, but not for fixing them in place. That requires an adhesive caulking or screws, bolts, frames etc.
I'm going to use some two-sided automotive adhesive tape as a spacer and to prevent the buytl from being squeezed out from around the edge of the portlight. I'm hoping this will contain the butyl permanently in place. My portlights are through-bolted to the cabin sides and I intend to use butyl on the bolts as per Mainesail's instructions in the butyl thread. I'll take some photos of the job and post them later. My thinking is that if the butyl route works, it is a practical, inexpensive solution and one can carry plenty of extra butyl tape on board for future work without worrying about it drying up or expiring. Please let us know how your windows come out on your Catalina, as we can all learn from each other's experiences with butyl.

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