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Powder Coat New Gas Tank

Old 10-13-2020, 08:27 AM
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Default Powder Coat New Gas Tank

I read the previous comments about powder coating and doesn’t seem beneficial. My 2004 Contender tank is being replaced and they just texted me for an answer on powder or not. Has anyone had luck with it?
Old 10-13-2020, 08:37 AM
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They used epoxy paint on my tank. Can't comment on PC as this is the first time I've heard of using it on a gas tank.
Old 10-13-2020, 09:07 AM
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Most important is the ground / bonding of the tank. As a minimum have two coats of zinc chromate primer on those new tanks.
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Old 10-13-2020, 09:08 AM
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Cold tar epoxy or Line-X
Old 10-13-2020, 09:34 AM
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I wouldnt. My last boat i replaced one of the fuel tanks. The fabricator coated it in grey epoxy. After seeing what happened to the powder coating on that boats whole windshield, I would never do it nor even try in a fuel tank below deck application. Without air and dissimilar metals at some point that will start to bubble and flake off. Im sure that will create another area in between to trap moisture for corrosion
Old 10-13-2020, 09:39 AM
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I see a lot of powder coat failures on tops where a harsh chemical has been applied...IE: around foot pads, outrigger plates, windshields etc where a rag and MEK or another harsh thinner was used to wipe up access 5200 . I would personally think that the Powder coat would hold up on the outside of the tank under normal conditions however ive never tried it.
Old 10-13-2020, 09:55 AM
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Real zinc chromate is banned now BTW.

I have a powder coated water tank in my bilge and it's held up fine for 6 years, so it is certainly better than nothing. If I had the choice, I'd do coal tar epoxy though.
Old 10-13-2020, 10:04 AM
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PC is an answer looking for a question in many cases and putting it on a fuel tank is one. Wash, etch prime and 24 hours later top with a moisture cured urethane (think POR 15) or epoxy coating.

I am a powder coater and the prep required to get a good bond with that much area might be hit or miss in the average shop and even if they get it right it's still powder and not the least bit malleable/flexible - the tank will move, expand and contract with changing temps and at some point the powder will start to fail.
Old 10-13-2020, 10:44 AM
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I appreciate your help. The first tank made it 16 years but it was a mess when taken out. If I can get at least that again, I would be thrilled.
Old 10-13-2020, 12:35 PM
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Originally Posted by scooperfl View Post
Real zinc chromate is banned now BTW.

I have a powder coated water tank in my bilge and it's held up fine for 6 years, so it is certainly better than nothing. If I had the choice, I'd do coal tar epoxy though.

I just had 4 cans dropped off last week.....
Old 10-13-2020, 01:08 PM
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no way in hell i would powder coat the fuel tank! i would line x or tar epoxy
Old 10-13-2020, 01:17 PM
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I would use two coats of a heavy duty epoxy paint, such as Devoe Bar-Rust. The trick with aluminum is absolutely minimal time between sanding and applying the first coat. On a sailboat mast, up to an hour appears to work. However less is always better. Oxidized aluminum is a terrible surface for paint to stick to.
Old 10-13-2020, 01:44 PM
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Originally Posted by c1steve View Post
The trick with aluminum is absolutely minimal time between sanding and applying the first coat.
This! Sand, wash, dry and spray
Old 10-13-2020, 01:44 PM
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Originally Posted by Absolute View Post
I just had 4 cans dropped off last week.....
That is the stuff! topcoat with EPOXY 2X Good to go!
Old 10-13-2020, 02:26 PM
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Interested to know why you chose aluminum tanks instead of polyethylene.

As per your question: coal tar, not powder coat
Old 10-14-2020, 07:40 AM
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I had no choice. The marina director called and said my boat was leaking gas from the bilge and I had to do something quickly. I could only find an aluminum tank fabricator. Like I previously stated, I will be happy for 15 years of use with the new tank. I love my 23T Contender and certainly don’t want to part with it.
Old 10-14-2020, 10:01 AM
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If you get it done, insist on marine epoxy primer. I had a tower chair powder coated and it lasted a long time. I doubt there are problems even after 10 years.
Old 10-14-2020, 10:25 AM
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Went through this myself back and forth. Yacht builders are using etching primer and then bedliner. I couldn’t see spending several hundred more dollars on all this being the raw metal thin tank lasted 20 years submerged in foam. I used a 2 part epoxy paint from Ace, acetone first then apply 2 coats. Key factor is air and NO FOAM! Seal anything it touches with 4200 and Make sure there’s an added flat plate for the sending unit to rest
Old 10-14-2020, 10:28 AM
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Old 10-14-2020, 11:30 AM
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When I did my (4) fuel and (1) h2o tanks in my 98' Contender 27' I used Pro-line Stronthium 2 part epoxy paint. The key to keeping your tank alive is NOT surrounding it with foam. No matter how well you seal it up it will get condensation and will eventually rust. Use plastic and rubber spacers to support the tank and let air flow be your friend. On my tanks I used outside composite decking material 1" thick with 1/4 rubber on both sides for supports and drilled a hole in the aft end of the compartment for any water to drain into bilge. This also lets air circulate into the space to eliminate any condensation build-up. I also used 5200 under the pads so there was ZERO contact against any part of the Aluminum tank. Remember no foam. JMO. Oh and I was specifically told by the company that made my tanks and also Sunshine Tanks to NOT anodize or powder coat the tanks. Make sure you completely wipe tanks down with acetone to keep them virgin so the coating you use adheres completely. Good luck we've all been there unfortunately.




Last edited by greenno; 10-14-2020 at 11:35 AM.

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