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Hello Jim, I trust your sub is coming along nicely. I've been media blasting the interior of my sub of late. Who knew that could be so much fun. ;{ The more I do of that, the more I want a composite hull. When you speak of emersion service, are you thinking more of long term emersion service? If some water did soak thru the coating the other standard types of coating should protect the metal as per usual, right? The guys at Rattleguard told me I could spray there product right onto bare media blasted steel that was to go in saltwater. I won't want to do that until I've done some long term testing on samples down the road. I think of the urethane coatings as more of a scratch resistant surface to protect the other coatings, as well as for insulation, noise reduction, eco reduction on the interior, and making the metal not cold to the touch and easy to hang onto, as in the case of my aluminum tubing conning tower guard. The owners of the Rattleguard brand that I last used, told me they have there product strayed on concrete and composite ponds and pools all the time. I should go check out some of those projects after years of immersed service. There are supposed to be some steel fishing boats in the Seattle area that have had the bottoms of there hulls coated with a Rhino liner coating. I should go source them out, and see what they have to say, after years of sitting in saltwater. I know they like to spray there own paint type coating on prepped truck beds before they spray on the finish urethane coating as a type of bonder agent. For now on the exterior I was just planning on using a urethane coating for the thruster tangle guards, conning tower guard, inflatable amas holding means and platforms, two small aluminum standing platforms next to the conning tower, and perhaps a couple other items. But not the exterior of the main hull. I was considering doing that on the next project however. " The beginning of knowledge is the discovery of something we do not understand. " ~ Frank Herbert Regards, Szybowski Date: Thu, 2 Jul 2009 08:08:14 -0500 Subject: Re: [PSUBS-MAILIST] Urethane Coatings on Steel Ballest & Drop Weights From: kocpnt@tds.net To: personal_submersibles@psubs.org Hi Brent,
I am not an expert, however I am an Industrial Painting Contractor.
I would like to use polyurethane because of it's resistance to chalking and fading, however my various paint reps all say that urethanes do not perform well in immersion service.
I used a zinc rich primer followed by two coats of high solids epoxy. These products can all be readily sprayed with the right equipment.
To have any chance of success, all polyurethanes should be sanded to remove gloss at a minimum and preferably removed altogether.
Best Regards,
Jim K
p.s. Spraying inside a sub really sucks!!!!
On Wed, Jul 1, 2009 at 10:19 PM, Brent Hartwig <brenthartwig@hotmail.com> wrote:
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