Leak at Mast Step
Rob,
We had a problem that manifested itself exactly as you describe with our 2003 Catalina 30 MKIII. When I removed the window to re-bed, it continued to drip water for several days....then weeks, so I had it looked at by local professional riggers, who said "you've got a problem", and indeed we did. We ended up on the hard, had the mast taken down, and then removed the step. First move was to cut away a small area under the step, which revealed soaked core. The cut was enlarged until finally an area about 30 x 30 or so was cut from the cabin top, so that all of the wet, pithy balsa could be removed. It was replaced with structural foam. There's a band of plywood about 8 or 10 inches wide running under the mast across the width of the cabin top, apparently intended to add enough strenth to avoid depression at the step - obviously not effective on our boat. We replaced the exposed portion of that with new marine plywood (not sure if Catalina used marine grade). Upon opening it up, we found numerous large voids between the outer hull and the cabin liner - great areas for large amounts of water to build up before it finally found its way out at the window. After drying out, adding the new plywood and foam, it was re-glassed and gel-coated, with non-skid on deck. We opted not to try to match the original diamond-pattern non-skid to save $$$, so it doesn't look 100% original now, but at least we know it's structurally sound. Total cost of repairs was a a little over $4K, including haul/re-launch and unstepping/re-stepping mast. I talked with Frank Butler and he was not helpful, even though our boat was less than 5 years old (we're the second owners, and Catalina only extends their 5-year hull warranty to the original owner - now we can see why!). Frank recommended simply injecting resin into the hull, rather than cutting any away. Obviously, with the amount of moisture/damage we had, this would simply not have worked. Though this is our second Catalina boat (first was a 22), our experience with Catalina Yachts and their "customer support" isn't what we'd hoped for or expected. As you might imagine, we'd think long and hard before buying another Catalina. A couple photos attached to show our damage. More available if they'd be helpful to you.