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Tank Rust Removal - Phosphoric Prep & Etch? #389251
08/12/11 4:33 pm
08/12/11 4:33 pm
Joined: Jan 2003
Posts: 523
San Diego, CA
Will S. Offline OP
Sponsor Member
Will S.  Offline OP
Sponsor Member
Joined: Jan 2003
Posts: 523
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, '68 Bonneville, '73 TR7, '55 6T
'71 Norton Commando

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Re: Tank Rust Removal - Phosphoric Prep & Etch? [Re: Will S.] #389289
08/12/11 6:49 pm
08/12/11 6:49 pm
Joined: Feb 2007
Posts: 586
California
Don M. Offline
BritBike Forum member
Don M.  Offline
BritBike Forum member
Joined: Feb 2007
Posts: 586
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.

Re: Tank Rust Removal - Phosphoric Prep & Etch? [Re: Will S.] #389309
08/12/11 7:21 pm
08/12/11 7:21 pm
Joined: May 2005
Posts: 146
Lyons, NY
B
Britishtools Offline

BritBike Forum member
Britishtools  Offline

BritBike Forum member
B
Joined: May 2005
Posts: 146
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.

Re: Tank Rust Removal - Phosphoric Prep & Etch? [Re: Will S.] #389707
08/15/11 1:08 am
08/15/11 1:08 am
Joined: Jul 2002
Posts: 140
Bakersfield CA
Tony Cornett_dup1 Offline
BritBike Forum member
Tony Cornett_dup1  Offline
BritBike Forum member
Joined: Jul 2002
Posts: 140
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

Re: Tank Rust Removal - Phosphoric Prep & Etch? [Re: Tony Cornett_dup1] #389760
08/15/11 11:16 am
08/15/11 11:16 am
Joined: May 2011
Posts: 134
Muriwai,New Zealand
L
Llewelyn Offline
BritBike Forum member
Llewelyn  Offline
BritBike Forum member
L
Joined: May 2011
Posts: 134
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


Moderated by  Alan_nc 


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