A few weeks ago I decided to remove some areas of cracked/crumbling grout around some 4-inch tiles in my stand up shower stall. To my knowledge, this grout is as old as the home which is 5 years, but I have only lived in it for 1 year. I assume the cracks were due to either poor installation or more likely due to settling of the new home.
This was the first time I had done anything with grout before, and stupidly I applied some pre-mixed DAP grout compound over the existing grout. I have since learned this was not smart because after it had dried for a few days it began to peel off after the first couple of showers.
I then went through the trouble of removing the old grout as deeply as I could with the grout removal tool I purchased (about 1/8 inch deep) and reapplied the same DAP grout after cleaning away any grout debris. I let this dry 2 weeks per the instructions then sealed it with a silicone sealant. Low and behold, after a few showers the grout is now starting to peel/bubble up and I am back to square one (actually I am worse off now because there is much more grout bubbling off now than there were cracks to begin with).
I think I may be using a poor grout for this application (even though it advertises for use in shower back splashes) and I was hoping someone could weigh in on whether this is the likely problem and if so, what is a good grout to use. Ideally it is a grout I could find at my local home improvement store versus a tile store, which I may not have in the area.
Some more info on the grout I used. It was a relatively cheap product from DAP, it is white and it is premixed. It was sold in small quantities and I believe the container I purchased was about 24 oz. The stuff seemed suspect to me from the start due to its light consistency (as compared to a more cement-like consistency) and because it seemed weak when dry (I could crumble dried pieces between my fingers). The peeling/bubbling I mentioned earlier appears to be a surface defect, as opposed to something happening behind the grout, and it only occurs when the grout gets wet during a shower
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