to me this is a topic barely addresses at all in the boating community.Not many people even know to do this or even consider it. I see you have done your research.So kudos to you. My boat has a barrier coat. To me it is a piece of mind thing. Not sure what boat you have but some tout anti blistering resins for their hulls. I am not a chemist and can't speak to resin composites but simple math tells me that it is easier to do a barrier coat upfront than chance it and pay big time for blister repairs down the road. I would do it as I have seen boats blister when they only sit a few months a year in the water. Also, think of this. To repair, the hull has to completely dry out, which could take a long time, then the repair shop has to get to it and complete the rest of the job and that me be longer than you would like when the fishing is hot!! Great question!!