There was water intrusion around one of my thru-hull bolts. The airex was a little soft for about 1/8 inch, then looked fine. There was no evidence of water migration beyond that first 1/8th inch. It is a very hard material. Not what you would think of as foam really. It was nearly impossible to remove...i snapped several allen bits with my drill trying to scrape out a 1" area around the thu-hull holes! There also seems to be a lot less condensation inside the boat and it really mutes outside noises. Compared to the hull on my Pearson 26, it seems like a bank vault
When you come crashing over waves beating into the wind, it doesn't pound at all!!!!