I'm building a large shower pan. For my preslope, I used "sakrete" sand mix for 3/4 of it, ran out of concrete, and then mixed Portand and sand to a approx 4:1 ratio to complete the preslope.

My concern is that the Portland mix part of the pan still seems wet after 3 days, while the sakrete side is a pale gray�.

The sand I used for the mix was outside and already wet -- so I just mixed in the Portland, and added a little water to get to the deck mud consistency.

The stuff is hard but still clearly not dry�It's a brownish color vs the pale gray of the sakrete.

Can I lay my PVC liner over this or do I need to wait until it dries? Will it dry? Any pro advise much appreciated!!