What to do about that leaky shower and tub caulking, once and for all. Best, Charles


Look familiar?!?
Look familiar?!?
With the point of your 5-in-1 tool, remove the old caulking.
With the point of your 5-in-1 tool, remove the old caulking.
The inside of the gap needs to be free of obstruction so the new caulk can fill the inside.  Remove what you can of the old grout off of the inside edges.
The inside of the gap needs to be free of obstruction so the new caulk can fill the inside. Remove what you can of the old grout off of the inside edges.
With a razor blade holder, clean the remaining caulk off of the surface of the tile and tub.
With a razor blade holder, clean the remaining caulk off of the surface of the tile and tub.
Using a Scotch-brite pad soaked in Ajax and water, clean outside and inside the crack.  All soap scum should be removed around the crack.
Using a Scotch-brite pad soaked in Ajax and water, clean outside and inside the crack. All soap scum should be removed around the crack.
Flush the area to remove the dirt and soap.
Flush the area to remove the dirt and soap.
Precisely apply tape to follow the profile of the crack making the outline of the finished caulk line.  Leave about 3/16 of tile exposed on each side of the crack, enough surface for the caulking to get a good grip.
Precisely apply tape to follow the profile of the crack making the outline of the finished caulk line. Leave about 3/16 of tile exposed on each side of the crack, enough surface for the caulking to get a good grip.
Polyurethane caulk works best.  This PL brand is available at The Depot.
Polyurethane caulk works best. This PL brand is available at The Depot.
Fill the gap with sealant, pushing sealant ahead of the nozzle.  The little bulge of sealant in front of the nozzle is the only way you will know that the gap is filled.
Fill the gap with sealant, pushing sealant ahead of the nozzle. The little bulge of sealant in front of the nozzle is the only way you will know that the gap is filled.
Making progress; caulk is evenly in place
Making progress; caulk is evenly in place
Put a big squirt of dish washing liquid in a quart of water and throw in a small rag.  Keeping your fingers wet in the super saturated soap solution, finger the caulking smooth.
Put a big squirt of dish washing liquid in a quart of water and throw in a small rag. Keeping your fingers wet in the super saturated soap solution, finger the caulking smooth.
Almost there.
Almost there.
After removing the tape, there will be little bit of a heavy edge which you can easily smooth down with a last light pass of your soapy finger.
After removing the tape, there will be little bit of a heavy edge which you can easily smooth down with a last light pass of your soapy finger.
Like a factory finish.
Like a factory finish.
The only thing that could have made this gasket turn out better would have been some band-aid colored caulk to blend in, but then you could not see how nice the caulk looks.
The only thing that could have made this gasket turn out better would have been some band-aid colored caulk to blend in, but then you could not see how nice the caulk looks.

Have a question about this project?

3 questions
  • Eroque022810
    on Aug 29, 2016

    I have read that you need to fill tub with water to keep from having chalk separate from tile how do you feel about this any truth behind that theory?

    • Lula Porter
      on Jul 5, 2017

      That would only apply if your tub actually sinks when it has weight in it. If it does sink, then you need to check under the floor around the tub for water damage, rot, insects. Someone could get hurt if the floor gives away while they are in it!
    • Peace Painting Co., Inc.
      on Jun 20, 2018

      And if the tub does move then the caulk will probably crack anyway.

  • Nancy Decker Cady
    on Oct 5, 2017

    how do i can a shower head

    • Peace Painting Co., Inc.
      on Jun 20, 2018

      The same way but you don’t need the tape, you could also use a clear oil base caulk there, DAP makes one it’s at the Depot, Home Depot that is!

  • Susan Johnson
    on Sep 19, 2018

    Is there a certain blue tape to use. I tried with blue painters tape and it also took some of the caulking off. Did I wait too long to remove tape

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