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Recaulk bath tile

A contractor tiled my bath a few years ago, and less than a year later the caulk between the tile and tub was cracking. I taped over it with some plastic sheeting and finally getting around to doing it.
The caulk is hard as a rock. I got some Caulk Be Gone that's supposed to turn it into soft putty. 5 hours later it's still hard as a rock. I even got a special tool to take it out and smooth the new caulk in. Doesn't do anything.
Any suggestions?

Re: Recaulk bath tile

Are you sure it's caulk and not grout.
If it's grout then it would crack. The proper caulk used would cure but have flexability.

Re: Recaulk bath tile

Yeah, I guess it's grout. A contractor on another board suggested it might be mortar, and to chisel it out.

I was pret nervous about chiseling it out, but I did it. Is it necessary to get every little bit out?
There're clearances between the tub and tile from 1/16 inch to more than 1/4 inch - next project is to level the house (I mean in a good way). Do I need any kind of backing mtl or can I just shove extra caulk in there - that's what the contractor it - mortar, grout or whatever it is as far as the eye can see.

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