How can I repair crumbly grout around tub?
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You need to remove it and apply new caulk.
Grout should not be used where the tub meets the wall or floor. It will always crack. Tub moves and shifts. Should use caulk. Remove the grout and apply caulk.
https://www.hometalk.com/diy/floors-ceilings/what-to-do-about-that-leaky-shower-and-tub-caulking-once-and-for-all-best-charles-137148
https://www.hometalk.com/diy/floors-ceilings/learn-how-to-caulk-like-a-pro-23425357
https://www.hometalk.com/diy/repair/plumbing/how-to-caulk-a-bathtub-beautiful-results-6490363
Fix Your Shower and Tub Caulking
Learn How To Caulk Like a Pro
How to Caulk a Bathtub (Beautiful Results)
Yes, William is right that grouting and caulking are not the same, and do not have the same functions.
Here is how to caulk around the tub: https://www.youtube.com/watch?v=eEsy7luzUTI
I agree - you should remove the caulk and add new caulk. I need to do this as well!