Time For Bottom Paint - Question On Barrier Coating

ttmott

PhD in OCD
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TECHNICAL Contributor
Apr 3, 2012
8,162
Space Coast Florida
Boat Info
2006 52 Sedan Bridge
Engines
Cummins QSM11
The boat has been hauled and out of the water for a couple of weeks now and well on the road to completing the general maintenance, new bottom paint, running gear checkout, and a lot of electronics upgrades.

First, to Mr. Higgins - thanks for stopping by and taking time for a shakedown; I know your time is valuable and just wanted to let you know how much I really appreciated it. Also, thanks for the tour on the 510 and 650 Flys; nicely executed machines and it's good to hear that the orders are coming in!

OK - so the hull is sanded down and through what looked like three or four layers of loose or powdering bottom paint to a solid previous coating. Where the old paint was thin, abraded, scraped, or chipped the sanding exposed gelcoat. The hull is in great shape, no blisters or other issues. The running gear is stripped and will be primed with Interlux Primocon before the Pettit Hydrocoat SR antifouling. Shafts and props removed and off to the vendor to check out and massage if required. New cutless bearings installed.

So here is the question - on the areas where the gelcoat is visible it was recommended that these be touched up with the Primocon as a barrier before applying the Hydrocoat, any experience on this?
Interlux tends to agree that Primocon is a very good barrier for this application. The Interlux 2000 barrier coating system is not really designed for this situation but more to a fully stripped hull so that is out of the equation.
 
We are located in about the same water conditions as you are. I keep my boat at a Sea Ray dealer's marina that also operated a full service boat yard so I see a lot of what goes on. In 25 years, I have never seen a primer used when followed by Interlux or SeaHawk ablative paints, which are the 2 brands we use here. Most boats are sanded to the point where 40-60% of the old paint is removed down to the gelcoat. Sea Ray's are not impervious to blistering, but with the gelcoat Sea Ray uses, these boats just don't have blister problems. However, if your bottom paint needs the primer for adherence to either bare gelcoat or your old paint, then I'd spot prime as you described, but a barrier coat isn't needed for blister protection.
 

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