When will they ever build a boat that never leaks?

I suppose it depends on what you consider a leaky boat. Whether it's an accumulation in the bilge or just a wet aft cabin mattress, in either case,  the sources are almost endless.  Rain water, washing the boat, bath shower area moisture, hull and fitting leaks, engine leaks, condensation, beverage spills, holding tank leaks, sinks overflow, swimmers and water skiers, refrigerator  and air conditioner condensate lines, fresh water system, etc. are all contributing factors on a regular basis.
The obvious question is, When does it leak? All the time, or only after some specific event. A little detective work could easily locate the source in no time at all. Sometimes it isn't easy to find and or fix the problem, but it is less expensive to do the detective work yourself than to try and pay someone to find it for you.

Leaks while running

    Engine sources
            Engine coolers
            Wet Exhaust system
             manifold or block cracks
            hot water heater hoses and or fittings (some hot water heaters use the cooling water from the engine to heat the water you drink)
           loose or missing engine block core plugs

    Thru-hull fitting sources
           Prop shaft
           Rudder posts
           Back flow from bilge pump or shower discharge fittings.
           Loose depth sounder thru-hull fittings.
           prop shaft strut bolts
    Other sources
           Speedometer tube between dash board and transom
           water cooled air conditioner lines and fittings
           air conditioner condensate pan drain
           refrigerator condensate line
           water tank and fitting leaks
           Condensation on the hull itself
     Topside leaks
          rub rail
         Safety rail stanchion bases
         windshield seam and fasteners to the deck
         external electric horn wiring under horn base
         Anchor locker hatches and or bins
        Cock pit drain fittings and hoses
        spot light base
        running light base
        under wood, plastic or metal step pads
        improperly located engine room vent covers
Testing for leaks Caused by rain and or washing of the boat should be tested with a hose to simulate the event. But don't just soak the whole boat. Isolate your testing to a small area at a time. Since water can flow a long way from where it enters the boat to the place you notice it. And don't be in a hurry. Give the water a chance to flow because sometimes dirt collects in cracks and holes and will repel water for a short time until the dirt gets saturated with water. Removing cushions, carpet and panels from the test area and the use of a screw driver and powerful flashlight are the only tools you will normally need.


Testing for leaks in sanitation systems.
One quick thought to get you started on this topic is that even if you smell an odor from the sanitation system, that doesn't mean it is leaking. Some sanitation hose has a tendency to absorb the smell from its cargo and will have to be replaced to solve the problem. You could try flushing and soaking  the system with chlorine to see if this is your problem, but usually this only lasts a short time. Over the years manufacturers have done a better job of solving this problem, so it might be a good idea to just replace the sanitation hoses.

A short note about hull delamination and balsa core saturation.

Although somewhat rare, the following two leak sources should be considered.
     Some boat hulls  and or decks, have a balsa core between two or more layers of fiberglass. Thru hull fittings and holes drilled into and thru this type of structure are hard to seal and can water log large sections of the laminated balsa. Any fitting or hole run thru balsa laminates should be sealed and reseal every few years to reduce the chance of balsa saturation and subsequent deterioration.

Delamination on the other hand is a structural fault in the hull caused by impact or abuse that has separated the layers of fiberglass laminate. Delamination isn't usually a vertical crack. Think of it   as being similar to corrugated or laminated cardboard, where the center of the laminate has been crushed or has disappeared. Water running between delaminated fiberglass panels can travel a long way before it emerges into the boat.

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