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If you do cement-based and polyurethane-based 2 layers, you can pipe for more than ten years.
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As long as the waterproofing is done well, ten years is fine.
The bathroom is waterproof, the standard practice is that the ground needs to be done all, and the wall should be at least meters, and it is recommended to do it full height. If it is a lightweight wall, then the wall must be made to full height. >>>More
To do waterproofing, you need to do it on the front of the water. >>>More
The current practice is generally to do it all over again. Because, if there is a problem in the later stage, it will be quite troublesome - looking for leaks, smashing floor tiles, destroying walls, etc. It is recommended to do it again, once and for all!
It can be changed, but it is very troublesome, reconnect a hot melt tube, or connect a hot melt tube on the top to the position of the shower
You can apply another layer or just patch up this small piece.