Question on using Evaporust

[Fjbj40]

Phosphoric acid is effortless, no mechanical action required. It dissolves and totally removes the rust. Follow up with water rinse with baking soda to neutralize, then IPA or acetone to dissipate the water, then coat with your choice of coating.

I would assume Evaporust or the other dedicated rust removers dissolve all rust?

[Nessism]

Phosphoric acid is effortless, no mechanical action required. It dissolves and totally removes the rust. Follow up with water rinse with baking soda to neutralize, then IPA or acetone to dissipate the water, then coat with your choice of coating.

I would assume Evaporust or the other dedicated rust removers dissolve all rust?

You don't need baking soda with phosphoric acid. I agree with the water rinse and IPA part, and some WD-40 doesn't hurt either, assuming you are not going to coat afterwards.

Evaporust is pretty amazing stuff. Only downside I've found is that it is expensive and has a limited lifespan. And speaking of lifespan...I've got a jug of phosphoric acid that has been recycled countless times and it still works fine. The sludge settles do the bottom of the jug and all you need to do is pour off the good stuff on the top. It can be diluted if you want and it will still work well, just slower.

[Downs]

ANy of ya'll have experience using the electrolysis method?

[Phred]

I used a gallon in my tank, swished it around and set the tank at different angles over a few days. Evaporust works slowly. Afterwards I strained it through a coffee filter as it can be re-used again. Rinsed with water and blew out the tank with compressed air and rolled up a sheet and fed it through the tank to pick up any residue. Evaporust becomes tacky so the sheet, compressed air and even a shopvac with a small diameter clear plastic hose attached to the hose with duct tape will do. As Nessism says, spray some WD40 in afterwards or it will flash rust.

[alke46]

I have only done 1 tank, but if I had it to do over then I would take it to a radiator shop and have it boiled out. After boiling, the shop could coat it with redkote. Not sure if that's the correct spelling but I have heard it is something that radiator shops do.

Good luck with yours and do post results.

[Andrew Vanis]

ANy of ya'll have experience using the electrolysis method?

I did, good result!!! would absolutely do it again. Trick was wrapping the electrode in plastic (fiberglass?) window screen to insulate it from touching the tank. Bent it to reach the far corners. worked VERY WELL. several day process with good results. On a tank that was really rusty in the corner it eliminated the rust and caused a leak, I was going to weld or braze it anyway so it was expected and it cleaned it up for the braze. Cheap, effective, non-corrosive.