Just finished painting my Dommies tank.
She he has had a bare metal respray and inside descale and frost por seal kit fitted.
The he inside of the tank had had a fibreglass resin liner in it. It resembled a dried out wall paper paste bucket inside. I cleaned it out by filling it with citric acid for a week and filling it with nuts and bolts and giving it a shake for 30 mins. Was like new in there when I finished.
Incidentally; citric acid it a fantastic cheap way to get rid of rust. One to remember.
Kevin
Attachments image-jpg image.0.jpg image.1.jpgNice job, I've used 3 gal…
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The active bit of coke is…
The active bit of coke is Phosphoric acid, so you have aleady tried it if a bit weak. I have used both critic and phosphoric, both get rid of the rust well and ignore the steel, citric leaves a clean surface but phosphoric leaves a thin layer of iron phosphate which acts as a mild rust preventative. Also tried the electrolytic method using a battery charger, works but too messy.
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Nice job, I've used 3 gals of value diet Coke to de rust a tank before! that worked well, I've also used vinegar but the metal has a tendency to flash rust after you've flushed it out and neutralised the acid. Going to try phosphoric acid next (millstone remover) and maybe electrolysis after that.
Dan