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#389251 - 08/12/11 4:33 pm Tank Rust Removal - Phosphoric Prep & Etch?
Will S. Offline
Sponsor Member

Registered: 01/05/03
Posts: 510
Loc: San Diego, CA
Hi All, I need to de-rust the gas tank on my '63 Matchless G12 CSR project. At the local hardware store I found Klean-strip Phosphoric Prep & Etch. My questions are:

Does anyone have experience using this product to clean tanks?
How long should the acid sit in the tank?
What do you use to rinse out the tank afterwards?
Could this product harm the chrome tank sides?

I'm familiar with other tank cleaning methods so no need to list 'em, just wondering about this product. I called their help desk and the guy new nothing about my application.

Thanks!
_________________________
Will S.
BSAs: '66 & '69 Lightning
Triumphs: '68 TR6R, '73 TR7, '55 6T
'71 Norton Commando

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#389289 - 08/12/11 6:49 pm Re: Tank Rust Removal - Phosphoric Prep & Etch? [Re: Will S.]
Don M. Offline
BritBike Forum member

Registered: 02/03/07
Posts: 572
Loc: California
I have used it a lot to clean out tanks & for other rust removal. Dilute it 4:1 to 10:1 for use in tank. Straight is OK for dipping rusty parts. As long as the rusty area is covered it will work on it's own but heavy rust will need some scraping to get below the surface to speed up the action. The usual screws, nuts or whatever you use is fine in a tank. Flush with water & dry as quickly as possible as it will start to rust immediately. Do not leave any in tank unless well diluted or it not dry well. Flush the tank again witn acetone, which will pick up any water & clean the surface for a tank sealer. There may be pits or holes in crevices that will leak after a tank is cleaned so I recommend it be sealed before painting. I use Caswell, which is ethanol resistant. Cheers, Don.

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#389309 - 08/12/11 7:21 pm Re: Tank Rust Removal - Phosphoric Prep & Etch? [Re: Will S.]
Britishtools Offline

BritBike Forum member

Registered: 05/23/05
Posts: 146
Loc: Lyons, NY
If you plan on sealing the tank with Caswell sealer, dont remove the rust (unless its large, flaking off pieces) The sealer works better with the rust intact.
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#389707 - 08/15/11 1:08 am Re: Tank Rust Removal - Phosphoric Prep & Etch? [Re: Will S.]
Tony Cornett_dup1 Offline
BritBike Forum member

Registered: 07/29/02
Posts: 95
Loc: Bakersfield CA
Will I flushed with water and Baking Soda and then again with water. Some do not coat because the phosphoric acid some times leaves a barrier which is converted rust. Good luck

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#389760 - 08/15/11 11:16 am Re: Tank Rust Removal - Phosphoric Prep & Etch? [Re: Tony Cornett_dup1]
Llewelyn Offline
BritBike Forum member

Registered: 05/30/11
Posts: 134
Loc: Muriwai,New Zealand
Phosphoric acid etches the steel and leaves a rust resistant phosphate coating . it is all i would do to my tanks unless so badly rusted it had multiple leaks then i might consider tank sealer but otherwise i would avoid them.Clean ,etch then use

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