As my beloved Mystic Rose has been out of the water for a couple of seasons the hull was completely dry, so I figured I would barrier coat the heck out of her while I had this rare opportunity. Besides I had to remove the previous antifouling system (which was only for fresh water) down to the gel. Which is another rare situation. I have barrier-coated several boats without any long-term (10 yrs plus) moisture-trapping problems, but it has to be done very slowly and patiently (five or six coats) and the hull has to be dry as a bone to start with. Get a quart and experiment with it on any non-porous surface and you will see how it sets up to create a very effective and durable moisture barrier. It's bullet proof. Old (even new) gelcoat is porous. I'm going to be taking my Vega on extended cruises during which she will be immersed for many months without a haul out. Good cheap insurance, I figure - though when you factor in the labour . . . maybe not so cheap. It also pays to keep the boat well ventilated. Cheers, T.
To:
AlbinVega@yahoogroups.com
From: peter@...
Date: Mon, 24 Jun 2013 06:09:03 +0000
Subject: [AlbinVega] Re: Barrier Coats
Hi Trev,
Does your Vega have blisters? If not, why barrier coat?
I don't understand the idea of barrier coating a good sound hull, especially one that's been blister-free for almost 40 years. There was a lot of discussion on this on the Classic Plastic Forum some time back, and the forum founder had this to say, in part:
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"Barrier coats haven't been around long enough for anyone to know whether they do what they are advertised to do over the long haul; in fact, information suggests that they fall substantially short of expectations and, in some documented cases, have even created moisture/blister-related issues where none existed before application of the miracle cure. In any event, they were conceived initially as gelcoat replacement products, for use in cases where the gelcoat was removed for major repair processes. like some of the legitimate severe blister problems that have been documented in the past. In this sort of application, they have their place, in my opinion.
My skepticism on barrier coating comes from their now-widespread use as some form of "preventative" maintenance that is a good idea "just because". I am far from convinced of that.
I think we should prove the theories before worrying about the potential results. A local weatherman, when discussing potential snowfall in the long-term forecast, often quips, "we don't shovel potential". From this, I extrapolate the statement that boats don't fall apart on theory either."
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The entire thread is at
Just my thoughts.
Peter
www.sintacha.com