I have a whopping $10 tied up in these. Can you clean the insides and get new gaskets and call it good, or should I get new ones? Very little rust in one and the spout works great.

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To remove rust from inside a can, here is what some military vehicle restorers do...
1. Get a big handful of nails
2. Get a big handful of bolts
3. Get a big handful of nuts
4. Get a 1/2 gallon of hydrochloric acid
5. Add all ingredients to the inside of the jerrycan and close it back up
6. Shake and stir for several days
7. Remove the ingredients and rinse with soapy water several times
8. rinse with clear water and let dry completely
Note: the Hydrochloric acid works just like kill-rust while the metal bits help scour off any loose particles.
It's a pain in the arse to sit there shaking an acid-filled jerrycan and disposal of the waste can be problematic, but it does work.
Not worth the effort in your case I don't think. You can probably find some decent surplus ones or maybe hook up with a military vehicle collector mob and find a source for the same can new.
I'd b very careful giving such advice without telling people how much to dilute the acid. the next person will do this with concentrated HCl and have a real problem on their hands, literally.
cheers,
J
Well I took some advice and did some looking around and found these for thirty bucks each. The seals are good but I need the ones for gas, as these are for diesel. Was this a reasonable deal? I'm not sure what the markings are, but they are scepters.
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Please excuse the garage.
I have these same cans... Anyone know if you can use them for gas???
With the correct VITON gaskets, yes!
https://forum.ih8mud.com/camping-outdoor-gear/225685-scepter-fuel-can-gasket.html