Just had our first rain with the TM open ... yup- the vent fan leaks. I'll be removing it completely and rebedding as others have, but will be using 3M 4200. It has the same great sealant qualities as 5200, but if you ever need to remove the fan again, you'll be able to with 4200. The 5200 version is 99% permanent. A product called Anti-Bond will soften 3M's polyurethane sealant/adhesives somewhat if removal is needed.
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