How do I use the redgard waterproofing in the edges and seams of rock board on a shower wall?

I'm in the process of tiling a wall around a bathtub using subway tiles and glass. I have already installed the rock board. I'm ready to start filling in the seams and edges with thinset motar. I would like to know if I put corners in first or thinset then use the redgard waterproofing or use the redgard first then the thinset.

Answers:
You would use the red guard first then the thin set. all red guard is is a water proofer. it is very expensive. $80 for 2lt(only covers 40sqft). You can also look into a product called kerdy. its also a water proofer, also expensive $144 for 54sqft. with kerdy you will have to use more thinset, but I think it is a much better product. a good website to try is Holmesonhomes.com. you can join a forum and get all the answers you need.

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