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All polyesters are hygroscopic. This includes polyester resins used in boat hulls. This has been known for more than 60 years. If polyester resins were not hygroscopic, we would never see osmotic blistering. https://www.google.com/search?q=%22polyester%22+%22hygroscopic%22

Based on a similar experience, my bet is you have a scupper drain hose that has come loose or is leaking somewhere. Locate all of your deck and cockpit scuppers and run several gallons of water through each of them one at a time, and check your bilge. In my case, a cockpit scupper drain was...

Airex T92 vs. generic 'Airex' Hi Thataway, No disrespect taken, and likewise none intended here, but you missed a key fact and I think both your points are incorrect. I've been researching this pretty heavily since before I bought my first foam-cored hull boat about 10 years ago (a...

Airex is a closed-cell PVC foam. The Airex foam itself can't get 'wet'. If there is water in the OuterFRP-Airex-InnerFRP 'sandwich', then it must be between the FRP and the Airex...which suggests delamination, where the bond between the foam and the fiberglass has broken. This is a problem...

Exactly right Kevin. But one thing you need to remember is that Bayliner used ATC Core-Cell, an extremely tough closed-cell foam specifically designed for below-the-waterline applications. Other foams used for coring will still soak up some water and are known to deteriorate/delaminate over...

Root cause? Lots of good responses here. I think your mechanic is wise to prepare you for a 'worst case scenario' of broken bolts. I am thinking about why this one exhaust manifold gasket started leaking in the first place (you have four of them). Typically these things don't just start...

Clamp meter test... I'm here to learn. That said, my understanding is that clamping the entire cord is definitive as a means to identify any immediate electro-shock drowning risk. A number of marinas I've been in use this method for both transients and new arrivals. A number of divers...

I've been on both sides of this language across a half dozen transactions over the years. Yes, it is standard and yes, it is fair and necessary for both parties. I can sympathize with the eyerolling, but consider this in the context of 'offer and acceptance' in contract law. It's easy to...