Quote:
Originally Posted by Comodave
I would still use butyl even if you have to install the trim ring first. Butyl will work with any movement of the trim ring or porthole much more than any caulk. Keep in mind that butyl takes a long time to compress so you have to put it in and then clamp the trim ring and let it set and over time keep tightening the clamps and let the butyl gradually squeeze out.
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How long are we talking here?