When I installed the corner splash guard I caulked carefully with clear silicone and did put a small chunk right in the corner to prevent water from seeping out through there and it works.
I did not caulk all around, only that little corner. I am told the lip from the tub goes up a few inches behind the shower surround and need air to dry out.
Also we always check - just to see - if water did come out - so far so good.
Denis & Diane
2010 Sabre 31REDS
Ford F-250 2011
* Happy Campers *