Miss Elyese is a 1954 Chris Craft utility runabout. We've taken care of it for many years. A leaky bottom has been getting worse. The fix: a whole new bottom. This era of Chris Craft was built with a bottom consisting of an inner layer of plywood, then a layer of muslin (which really provided the waterproofing), then an outer layer of mahogany planking.
First the seats, engine, and gas tank come out. Then it goes in our slings:
Over it goes.
Begin by removing the outer planking, exposing the inner plywood.
The muslin had rotted to shreds long ago. Waterproofing had been provided by working seam compound in the edges of the mahogany planking. I hesitate to call them seams as they weren't really designed for caulking. Eventually the planking comes a little loose, the inner plywood deteriorates, the outer planking gets scraped and sanded thin over the years. Also there are apt to be problems with deteriorating frames and chines. Then the plywood comes off.
The skeleton is visible. We replaced three rotted frames while we were at it.
A good fix is to replace the bottom with laminations of plywood which we did. We used three layers of 5 mm sapele mahogany marine plywood, the best plywood.
The layers are bedded in 3M 5200 adhesive and temporarily fastened with sheet rock screws.
The sheet rock screws are removed and exchanged for 316 stainless steel screws. I anticipate this to be a long term fix, definitely 50 years. After the new layers were applied we found the keel was a little shallow for much of its length, so we applied a quarter inch shim.
The bottom got two coats of clear epoxy, then two coats Awlgrip epoxy primer, then two coats red paint
You can see the new bottom once the boat is upright.
The boat's back together: engine, seats, floorboards, fuel tank, windscreen.