Hey, Sunkissed I know I responded to this... but it's not here??!?? (I'm sure it's something I did or didn't do - I'm pretty much a bull in the china shop with computers LOL)

The mix I always have used is a 2:1 white cement to marble dust (by volume NOT weight). This mix will grout it and, as Ben says, patches plaster pools well. If you're looking to reset coping or tile, use a 1:1 mix.

Sorry for the delay in responding.