I am not sure I understand the logic here.
The problems of osmosis in production boats were proven to be the fault of resin suppliers, and significant court action resulted. Since 2010 most production boats have a vinylester layer applied below water
, and there has not been a single
case since that major change occurred.
What I don't understand is assuming the resin is faulty how a solid glass core
will mitigate this issue. Yes, you can crack a walnut with a sledgehammer by insisting on a fully vinylester core but even then if a supplier problem occurred, or it was incorrectly applied, no matter how unlikely, you could have issues.
So it seems to me that we confuse the manufacturing process with the technology. Polyester cored boats have been built for decades with no signs of osmosis. The problem was in the process, not the technology, and if the process is not first class then no matter what the technology a bad boat could result.
From my observations since most production boat manufacturers adopted ISO around 5 years ago the repeatability of quality has been reasonable, whereas before one boat of the same model could be very different to another.