Sealing the Tank

OpTiCz

OpTiCz

Coast to Coast
There's a lot of surface rust in my tank....
The instructions for sealing it with Caswell says to rinse it out with acetone and drywall screws.
I've done that, but there's still lots of surface rust.

Can I fill it with CLR, or something else to get it all out?
For those who have sealed tanks, did you get rid of all rust completely, or is it somewhat needed for the sealer to cling to.
 
Thanks dean. I'm pretty sure I shouldn't apply oil or wd-40 before the caswell.

If I flush with CLR, then rinse, how quick will it rust? I want to put in the Caswell quick, but the tank does need to be dry....

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I've read that Caswell was the best.
I have the kit ready to go, I just want to get the tank as clean as possible.
 
I have heard caswell is best too. Supposedly its recommended by Ducati for all their new tanks to protect against ethanol. Its my understanding that the tank does not actually need to be perfectly rust free for the caswell coating (or any coating for that matter). I think that stuff sticks better when there is a little roughness inside, ie, rust inside. As far as how quickly do you get flash rust- with the right conditions, it can flash rust, well, in a flash.
 
I have used both Por15 and Kreem to line gas tanks. The two products are dramatically different, and have slightly different circumstances that they are best suited for. Por15 is more like a paint, and creates a thin coating that seals the surface to prevent future rust. Kreem is more viscous, and leaves a thick, rubbery coating that is well suited for a more heavily damaged tank interior.

Both are available as a "kit" of products that include cleaner/etcher/prep steps that remove the rust first and prepare the internal surfaces for the coating.

For light internal surface rust in an otherwise sound tank, I would use Por15.

For a tank with heavy rust that may have even caused pinhole perforations, Kreem is best. It is a much thicker coating. After you pour in the coating, you can roll the tank around for a couple hours as the coating thickens and eventually congeals into a thick, rubbery lining.

Just follow the directions to the letter, and don't rush it. You don't want to "puddle" Por15. I made a vacuum device to reach inside the tank and suck out any excess Por15 that would have otherwise pooled in the tank and taken a very long time to dry. Any liner you use, make sure to let it dry a good 3-4 days. After one day, I stick a hose in the tank and feed low pressure compressed air to enhance drying.
 
Already bought caswell days ago.
Just posted my experience with it.

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por15 also makes a cleaner that may work better then CLR. its called marine clean it was only 8 bucks at car quest. supposed to removed rust well. and once you rinse it all out use a hair dryer or heat gun(as long as no flam vapor is in the tank) to dry it quickly.

Mike
 
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