Can I put plumbers putty under caulk?


Old 11-12-19, 05:23 AM
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Can I put plumbers putty under caulk?


I usually put new caulk around my bathtub every 5 years because the caulk develops some mold and turns from white to grey color and many places.
I need to re-caulk the bathtub this year again. The gap between my bathtub and tiles is too deep, so I have to put at least two layers of caulk. It requires a lot of caulk and take more time. Is it possible to put plumbers putty as a first layer and then, on top of it, put the caulk? Is it going to work?

Thank you very much for your answers.

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Old 11-12-19, 05:35 AM
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You "could" but it would be better if you used foam backer rod.

I would only be using bath sealants that say they are mold resistant.
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Old 11-12-19, 05:39 AM
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I would NOT use plumbers putty. It's basically an oil based clay. You'll probably get oil residue on the joint trying to install it which could cause adhesion problems for the top layer of caulk.
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Old 11-12-19, 05:59 AM
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Silicone or polyurethane caulk should adhere ok to the plumber's putty.
Old 11-12-19, 06:06 AM
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As PD and Xslpr, said it's a bad idea. In addition it will very likely stain the grout and possibly stain any tile that might seep under the glaze.
Old 11-12-19, 05:05 PM
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In my 33 years as a plumber I have only used phenoseal..

Phenoseal Products

Get it at your home store. Its the only Vinyl product I am aware of.
Old 11-18-19, 05:08 AM
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Thank you for all answers.
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