Lowering the bath tub 2 inches means that to keep the sink at the original height, I need to raise it 2 inches. Leaving it low would mean having to lean down too far. In fact I would raise it up farther if it wouldn’t interfere with the window.
I cut the bottom of the sink support off just above the curve with my dremel tool. Next I made a form out of plywood and plastic laminate that spaces the bottom down 2″ and used double stick carpet tape to attach it to the upper section.
Here you can see the space between upper and lower sections. I shaped the corners at the back with modeling clay to match the curve of the piece. The surface of the upper and lower sections have been tapered and roughed up with an angle grinder to prep for the fiberglass layup. Before I do that I will need to treat the form with a mold release and two coats of gel-coat.
After the gel-coat cured I began laying up the fiberglass in several layers to build up thickness to match and then a couple more layers that lapped over the top and bottom pieces. This is what the inside looks like after removing the form.
The outside needed some shaping to blend into the curve of the sink. I mixed up some more resin and added a powdered fairing filler to make it thick enough so that I could shape it. Once it hardened I sanded it smooth, ready for eventual refinishing. The large hole was made by the previous owner, probably to access the plumbing. Fortunately it doesn’t show when installed and I might need it someday.
Once it and the tub are refinished I will mount it back onto the tub.