This is my first time using Water Clear. I'm trying to cast in a wood table top to simulate a small stream with pebbles. I degassed A and B independently and then again when mixed but still get bubbles. Does the wood need to be sealed first and do the pebbles need to be treated? Also, would Clear Cast be better for my application? The groove I am filling with the pebbles and resin is about 1 inch wide and 3/4 inch deep.