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If your caulk is only lasting a few weeks, you're doing something wrong. I caulked my tub 5 years ago with GE silicon (from Home Depot/Lowes) and it's still very much in tact. To avoid mildew you'll have to towel dry the shower after each use, or give it a weekly cleaning. I think pure silicon is more durable, but I prefer acrylic-latex because it finishes better.
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