Leaks are the least of your problems with this poorly designed and built boat. I have sailed on this boat extensively. Here are the obvious short comings: Track for head sail sheet lead to short for working
jib, coaming design lets waves over the bow run along cabin and into the ass of the person unfortunate enough to be sitting on the windward coaming, locker storage in the cabin to shallow to hold anything of substance for cruising, wiring poorly run all over the boat, flimsy sailing hardware, the cheesiest turn buckles and boots ever conceived, pan liner squeaks after a few years when separating from hull, very weak and poorly designed stanchions which leak after a few years, bow sprit of tall
rig delaminated after 2 years of use, rudder assembly has no provision for wear and has tremendous slop after five years of half year use, poor light fixture placed in strange positions, most of the wing ding keel boats have permanent port list, telephone pole sized spar, other than these few short comings the boat is only marginal. All Catalinas come with fixed three blade props as standard from the factory, does this tell you something about their intended use?