Don't make the same mistake your friend did. That installation will only work in the best of conditions, but is a waste of money at best. Mastic will re-emulsify when it gets damp. Should never be used on floors, it can be used on your kitchen backsplash however.
Tile 4 You LLC Troy, MI
KERDI Shower Specialist ... DITRA Installs ... Product-Method suitability consultation. I have NEVER made a mistake, I thought I did once...........but I was wrong! - PRODUCTS ADVERTISED WITHIN MY POST ARE NOT ENDORSED BY ME!