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Is All-purpose Joint compound waterproof?

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I have extra joint compound and i'm wondering if i could use it to seal the edges in my shower and tub. Thanks

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  1. no


  2. NO, it is not! Use tub and tile sealer.

  3. No, joint compound is not waterproof. Use silicone caulk. It comes in various colors. Many types available. Shop for quality, not price. Read instructions-get type made for specific use..there are MANY on market. Remove old caulking first.
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