Covering artificial with mortar?

[SRT80]

So I was messing with some artificial driftwood. I thought it would look cool and allow the fish to swim around. I've always just made a mound with the live rock. Could I take some emarco 400 mortar and spread over this and use a sponge to give texture? Im talking cover the whole area with the gray mortar so theres no brown to be seen. I could still have room to add some smaller pieces of live rock around the bottom and back.

I don't know. I know it doesn't look that natural but I like it. Might just redo my FW tank with it.

Thanks.

 

[Reefing Madness]