1. The Reality of the Second Hand Market

Buying a second-hand yacht can be an excellent financial opportunity, but it is also a minefield. In more than 30 years of naval expertise, I have seen everything: from cosmetic repairs that conceal structural damage to engines with manipulated hours. The seller (particular or broker) has a clear incentive: sell at the best price and as quickly as possible. His work as a buyer (or as an independent expert) is to see beyond the brightness of the painting.

Then we detail the 15 most frequent hidden flaws we find in our pre-purchase inspections, divided by critical areas of the boat.

2. Defects in the Helmet and the Living Work

The helmet is the fundamental structure. A defect here is not only expensive to repair, but can compromise the safety of navigation.

1. Osmosis y Ampollas en Cascos de Fibra (PRFV)

The osmosis is the “cancer” of the fiberglass helmets. It manifests itself as blisters full of liquid in the living work. Many sellers handle them, apply a layer of epoxy and paint them. An expert expert expert uses moisture meters and percussion tests to detect the real extent of the problem.

2. Delamination in Cascos Sandwich

In modern yachts with sandwich core helmets (balsa or foam), delamination (layer separation) is a serious defect, often caused by unrepaired impacts or water leaks in the core.

3. Galvanic and Electrolytic Corrosion in Metallic Cascos

In steel or aluminium yachts, corrosion under the floating line can be devastating. The lack of maintenance of the cathodic protection system (anodes) or failures in the ICCP system are common causes.

3. Defects in Coverage and Superstructure

4. “Soft Spots” (Points Blandos) in the Cover

The passing areas (cockpit, walkways, proa) suffer constant wear. If you feel that the cover “cedes” or sounds hollow, the core of the deck is likely to be rotten by water infiltrations.

5. Filtrations in Cover & Casualty Boards

Silicone or polyurethane seals are degraded with the sun and the salitre. A cracked board in a raisins or at the base of an accessory (bits, cornamusas, antennas) can cause internal flooding or severe electrical damage.

6. Degradation of Windows and Escotillas

Methacrylate or polycarbonate windows become opaque and brittle over the years (crazing). Replace the windows of a superyate is one of the most expensive repairs that exist.

4. Defects in the Machine Room

7. Corrosion in Critical Components

The atmosphere in the machine room is hostile: heat, humidity and salt. Look for corrosion in the exhaust collectors, heat exchangers, sea water pumps and electric frames. Corrosion in battery terminals is an indicator of poor maintenance.

8. Oil & Refrigerator fumes

Some vendors clean the machine room thoroughly just before the inspection. An expert knows where to look: under the cunning joints, in the axes’ retains and in the connections of the hoses. Use a flashlight and a mirror to inspect the lower parts of the engine.

9. Manipulated Motor Hours

Although digital accountants are more difficult to manipulate, it is not impossible. The true test is in the analysis of oils (wear metal analysis) and in the general state of the auxiliary components (pipes, sleeves, supports).

5. Defects in the Interior and Systems

10. Occult Moho and Humidities

The smell of “closed” or mold is the first alert. Lift the carpets, open the cabinets (especially those that give to the hull) and look for water stains or eflorescences on the walls. Poorly maintained air conditioning systems are a common source of condensation and mold.

11. Obsolete or dangerous electrical systems

In yachts for more than 15-20 years, electrical systems may not comply with current regulations (ABYC, CE). Look for peeled cables, insulating tape connections instead of terminals, and the absence of differential switches (GFCI/RCD) in wet areas.

12. Defects in Sentinel Systems

Sentinel pumps must work automatically. Check if there is water accumulated in the sentinel (active leak signal) and if the pumps are activated correctly with the floats.

6. Defects in Propulsion and Government

13. Lost in Ejes, Helices and Timones

Dry inspection (varadero) is crucial to assess the state of axes (albeo, wear on couplings), propellers (cavitation, blows) and hemons (holgura on bearings, corrosion).

14. Waste in the Retenes (Stern Glands)

The retainers that seal the entrance of the propeller axis in the helmet are critical. Excessive drip indicates wear and requires immediate adjustment or replacement.

7. The Most Dangerous Defect: Lack of History

15. Incomplete or non-existent maintenance documentation

A yacht is a complex machine that requires rigorous maintenance. If the seller cannot provide maintenance records, repair bills and system certificates, assume that the ship has been negligenced. The lack of papers is, in itself, a serious defect.

8. Related Articles of the Expert Network

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