Hi guys, I'm about to tile my bathtub surround and have some questions regarding moisture barriers. I already have the 1/2 durock cement board and 6 mil plastic sheeting. Before I put up the plastic sheeting on the studs, I wanted to double check to see what people thought was a better moisture barrier... Redgard painted directly onto the cement board or the 6 mil heavy duty plastic sheeting attached to the studs. If you pick one over the other, can you tell me why? Is there a difference in how well each one will protect from long term moisture problems? It would be nice to hear the pros/cons to Redgard vs the plastic sheeting. I'm debating whether or not I should just go buy some Redgard and leave my plastic sheeting for another purpose. But if they both offer the same long term protection, then I'm happy just sticking with my plastic sheeting since it will save me a trip to the store and I am more familiar with that as a moisture barrier.