$5,000 Catamaran Refit Uncovers Severe Deck Core Rot, Major Repair Ahead

A $5,000 catamaran can look like the smartest buy in the yard until the first cut into the cockpit tells a different story. What’s Kraken Sailing found severe wood rot inside the deck core on its 2000 Wildcat 350, turning what looked like a routine refit into a major structural repair.

The boat was bought as a project vessel for a world-sailing rebuild, but the scale of the job changed fast once the crew opened the cockpit area. The wet balsa had to come out before the boat could move forward safely, and that changed everything about the timeline, the budget and the confidence level around the hull. On a boat like this, hidden moisture damage is not a cosmetic problem. It is the difference between an honest project and a structural rebuild.

The repair path is the standard one, but it is not a cheap one. The crew plans to remove the rotten core, rebuild the area with Divinycell, then lay it back together with fiberglass and epoxy. That sequence matters because it shows exactly how these jobs are won or lost: cut back to solid material, clear out every damaged section, replace the failed core with something dry and stable, then restore the laminate properly so the deck can carry load again.

Divinycell is not some random substitute pulled off a shelf. Diab says its PVC foam core materials are widely used in marine sandwich structures, and the company markets them for light, fast and tough boats and vessels. It also says the material has low weight and low water absorption, two traits that matter when you are replacing a waterlogged core in a sailing platform that needs to stay stiff without adding dead weight. Diab says PVC foams came into wider use as core materials in the 1970s, which puts this repair squarely in a long-established marine method, not a trendy workaround.

That is the hard lesson here for anyone chasing a cheap catamaran. The sticker price on a $5,000 project boat says almost nothing about the real bill once the deck is opened up. In this case, one cut exposed a rotten core, a bigger structural scope and a reminder that bargain boats often hide their true cost in the laminate.