I use polyurethane caulk, butyl caulk, or pure silicone (non-paintable)
seal. They are all equally easy, in my experience. Just wear rubber gloves,
as all these caulks are hell to get off hands. Also, have a rag and a putty
knife for cramming the stuff into cracks and seams, and doing clean-up. Get
the high quality cartridge guns to apply the caulk, as they work much better
than the $1.99 ones.
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