Can an acrylic caulk be used on top of grout to patch eroding grout?
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It will take you a little elbow grease and a grout saw, but I would remove the areas that are eroding and replace the grout. If the grout is so brittle it is already coming out, it should be relatively easy to remove. Grout saws are hand tools and cheap. Make sure you replace it with the right type of grout for areas that are going to be wet. The original grout should have lasted much longer than 3 years. I would never put caulk down in place of or to patch grout.
Susan is right . It's messy, time consuming but you can do it . Remember to wear gloves when you put in the new grout. And don't forget to seal it properly when its dry. That's why the old one is coming apart. Here's a link to help
https://www.familyhandyman.com/tiling/grouting/how-to-regrout-bathroom-tile-fixing-bathroom-walls/view-all
Susan and CD - thanks for your input and for providing the link to regrouting tile. I suspected that applying caulk on top of the grout was NOT a good idea but I needed this confirmation. I may try to get another estimate or two - or roll up my sleeves and give it a try myself! Thanks again for taking the time to provide helpful advice.
Julie C