RE: [PSUBS-MAILIST] Urethane Coatings on Steel Ballest & Drop Weights

Hi Jim and Sean,

I found some data from Rhino regarding using some of there industrial coatings for marine applications. Looks like the Rhino Hardline and Hi-Chem coatings are best for boat hulls. I suspect that the basic Rhino coating will work ok for steel subs that live most of there lives in the garage if they have quality coatings under the Rhino coating.

"Rhino Linings formulations are tremendously versatile for marine applications. Each can be utilized on boats, ships, docks, decks, personal watercraft, trailers and more. All Rhino formulations provide a monolithic, airtight and watertight seal preventing rust and corrosion penetration. The linings also insulate vessels from noise and vibrations. Unlike gel coat, the Rhino TuffGrip formulation has a highly flexible, elongate-able membrane that allows the coating to stretch along with the deck’s surface. This flexibility ensures that its durable and long-lasting finish won’t creak or peel.

Rhino HardLine - Superior chemical resistance and protection against impact, abrasion and corrosion to deliver maximum protection and toughness. HardLine Applications - any surface requiring tough, hard protection, like boat hulls, propellers, dredge equipment, tipes, tanks, dry-dock patches

Rhino Hi-Chem - Excellent stability for immersion applications and chemical resistance. Superior rifid formulation with highest amound of molecular cross-linking, Hi-Chem Applications - highyly corrosive marine enviroments, any application requiring protection from diesel, crude, oil, gas, chemicals, salts, or lye"

http://www.rhinoliningsindustrial.com/gfGy6S44anlz/1211224947USA-Rhino%20Protects%20Marine%20Industry.pdf

Here is some Rhino data on using there Rhino Hardline coating on aluminum boats.

http://www.rhinoliningsindustrial.com/gfGy6S44anlz/1242407822USA-Aluminum%20Jet%20Boat%20Hull%20-%20Alaska.pdf

Regards,
Szybowski

Date: Thu, 2 Jul 2009 19:18:07 -0500
Subject: Re: [PSUBS-MAILIST] Urethane Coatings on Steel Ballest & Drop Weights
From: kocpnt@tds.net
To: personal_submersibles@psubs.org

Hi Brent,

I'm not sure about the rattle guard product as I am not familiar with it.

I was refering to traditional Urethanes.

Be sure that you get your information from a technical person who is certified.

As I'm sure you know, many salespeople will tell you what they think you want to hear.

Best Regards,

Jim K

On Thu, Jul 2, 2009 at 4:12 PM, Brent Hartwig <brenthartwig@hotmail.com> wrote:

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!!!!