Sheetrock and Tilling over it?

[pumper1us]

I'm in the process of a total bath remodel and am getting ready to put up marble tile on the walls. My prob is that I had to use a mold preventative on the sheetrock and need to know if there is any other "sizing" or prep I need to do to the walls before I start the Tiling of the walls? I did the 30min tape test to confirm the paint/mold preventative way applied well and it passed the test but after sanding what should I do?

[HayZee518]

apply a sealer after sanding then do the quikset on your tile.

[pushkins]

I hope this drywall your tiling isn't in a wet area ?

[Spearo]

How much mold and where? I would use a drywall that is m.r. (moist resistant) It comes in a green color on one side and holds-up 100% better that the regular stuff, specially in tub and shower or around wet areas.