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Hi Todd, I just finished and 1 tube was enough, but they're only 5 bucks so I got 2.

I taped it off with painters tape, did 1 side at a time. I slopped it in there real good, then went over it with a popsicle stick to smooth it out.

Never used a caulk gun before this in my life :) ... we'll see how it turns out.