I know I’m responding to an old entry, but some may find it helpful. The first sprinter westy I purchased was reported to have a bathroom (and the rest of it) in good shape. Unfortunately this was far from reality. I wound up sinking (no pun intended) a lot of resources into this camper before I could honestly sell it to someone else as a functional camper. The original sink “repair” appeared to be hastily globbed on epoxy puddy which is a very poor adherent to our sinks and easily flakes off. This revealed a starting point for repairs. Fortunately a polyester/fiberglass repair can actually improve the strength of the sink and shower pan and restore original shapes. Please see the following pics to see it’s not that difficult...just takes time and patience. This was my first effort at a fiberglass repair.