I recently installed a cement shower pan but I had to use two pvc shower pan liners because of the size of the shower. I used the specified pvc cement to "weld" the two liners together at the seam. However, I'm not entirely convinced this will be 100% waterproof at the seams. Unfortunately I completely forgot to test the shower pan liner after I installed it and I already poured the rest of the deck mud on top to the final height.
So my question is, can I use Redgard over the shower pan at this point (over the top deck mud layer) to make sure I won't have any leaks? I already saw a few questions about this on here and they mentioned a "mold sandwich" due to the cement not being able to drain any liquids if there is a leak in the first layer. However, I don't see this as an issue since the drain has weep holes at the pvc liner.