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Old 03-12-2011, 01:27 PM   #1
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Caulking a Bathtub, need advice


I put down some caulking in both my bathrooms around the bathtubs. My home is 5yrs old and these bathtubs are built in. I used some regular bathtub-rated caulking that I bought from the hardware store (I think it was Mono). I filled the bathtub up with water and did my work.

Fast forward to today. I have noticed that the bathtub moves when someone is in it. It moves very slightly up and down. This caused the caulking to crack and be pulled apart (because some adheres to the wall, and some to the bathtub itself). This is not a case where I added too little caulking because in some spots, I added gobs of it and it still is being pulled apart. There is just too much movement in the tub while it's being used.

Is there a special type of caulking I could use that is more flexible then the standard stuff I bought? Are there any tips you can offer me in this regard?

Removing the bathtub is not an option.

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Old 03-12-2011, 01:32 PM   #2
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Caulking a Bathtub, need advice


The gap MUST be completely dry before installing any brand or type of caulk.

You could use "Big Stretch" but it isn't to be submerged for long periods or for showers I don't think. Read the label and see what you think.

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Old 03-12-2011, 03:04 PM   #3
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Caulking a Bathtub, need advice


When I first applied it, the tub and the walls were completely dry.
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Old 03-12-2011, 03:27 PM   #4
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Originally Posted by RealMarkP View Post

Fast forward to today
....from when? How much time passed between laying the caulk down and using the tub? Did you remove all the old stuff first?
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Old 03-12-2011, 03:37 PM   #5
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Caulking a Bathtub, need advice


I would say there is too much movement in the tub.
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Old 03-12-2011, 06:25 PM   #6
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....from when? How much time passed between laying the caulk down and using the tub? Did you remove all the old stuff first?
Yes, I removed all the old stuff first, I wiped it down and let it dry for a full day. Then I applied the new caulking. I let the caulking set for over 24hrs, like the instructions said. While it was setting the bathtub was full of water to weight it down.

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