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As shown in the pic, my one-piece tub/shower was installed poorly. There is a gap between the vinyl top layer and the tile floor. To make it look better I was thinking about caulking it, but I think the gap is too large (up to about 1/4") and there's nothing but air behind it. Recommendations would be appreciated.enter image description here

  • FYI, tubs aren't usually installed on top of tile. This isn't a problem of poor tub installation. It's due to a dip in the floor. No big deal. Just wanted to clarify. – isherwood May 18 '17 at 20:54
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You certainly can, if you do it carefully. Here are my tips:

  1. Use clear silicone. Any color (including white) will be much more conspicuous over the grout joints. Clear will transfer the existing colors and blend much better, almost disappearing.

  2. Run a roll of masking tape along the floor, tight to the tub. Once you've tooled your caulk you can remove this for a clean line.

  3. Cut the tip of the tube small. You want it to fit the smaller areas of the gap well to minimize squeeze-out. At the wider areas, slow your slide rate to allow the gap to be filled well.

  4. Inject a substantial amount of caulk into the gap. You don't want a wall of caulk that will collapse. You want a solid rope.

  5. Be sure the gap is completely dry when you apply the caulk. Silicone doesn't grab wet surfaces.

  6. Tool the caulk with a finger, wiping the finger clean on a rag often. You don't want excess caulk oozing out around the sides.

Good luck.

  • OK then - I'll give it a try. Thanks for your detailed instructions! – NotHandyMan May 19 '17 at 15:02

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