I've used it on my deck stanchions and hardware with no issues at all…..love the stuff for SEALING. If you've got compression style perimeter mountings on your windows, have at it! I plan to do the same. I've got two year old balls of butyl tape I left on my deck in the sun and weather. The stuff still feels just as flexible and capable.
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Larry
"When life gets hard, eat marshmallows”.
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