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First of all, has your bathroom been waterproofed before? If it has been waterproofed and there is no problem, then even if the tile joints are not very good, then it will not cause water leakage, but only affect the appearance. As for the waterproof paste you said, I personally do not recommend using it, first of all, I can't be sure what its waterproof effect is, and secondly, its environmental protection, aesthetics can not be confirmed, so it is recommended to buy a better tile grout to get it!
Or tile it, this is the most reliable construction method.
DO WATERPROOF FIRST: WATERPROOF HEIGHT: THE WATERPROOF HEIGHT OF THE BATHROOM SHOULD BE MORE THAN 180-300MM, AND THE SHOWER AREA SHOULD BE MORE THAN 1800MM. >>>More
To do waterproofing, first of all, the ground is leveled, so that it is easy to do waterproofing, and it also saves waterproof materials, adhesives, and aesthetics in the later stage. >>>More
After the bathroom decoration is completed, the bathroom waterproofing will be started. >>>More
If you plan for the long term, it's best to redo it so that it's more waterproof.