Tiling a Shower Shelf/Cubby
Well you did it correctly. Waterproofing NEEDS to be done over ALL of the CBU. Cement backer board is NOT waterproofing. This is why you need to use RedGard or any other waterproofing.
As for too much RedGard, probably not. You need to make sure you have 100% coverage in the corners and definitely in the niche. No pin holes allowed!
Good luck with finishing your project.
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