V-notched trowels are mostly used for mastic or glues. If your not too far into the project, if it were mine I would start over. Did you use Redgaurd over your CBU? If not, I would highly recommend it.
A forum community dedicated to Do it yourself-ers and home improvement enthusiasts. Come join the discussion about tools, projects, builds, styles, scales, reviews, accessories, classifieds, and more! Helping You to Do It Yourself!