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A caustic soda hot tank would make short work of the paint on those forks, just have to power wash well after the bath. DonG
Engine rebuilding shops usually used hot tanks, radiator repair shops also use this technology, perhaps its changed but some one in your town should still have a hot tank going. I have a 50LB bag of caustic soda beads if you want to mix up your own bath, used to be able to buy caustic from industrial suppliers like Acklands etc. The best caustic was called Oakite, it would even remove surface rust, another was Red Hot Mamma, try an industrial cleaning supply joint. The only problem with caustic is you should not use it on Aluminium, pot metal, or on anything you cant rinse off, like inside of frame tubes, but if the object has open surfaces caustic works well and fast. DonG
Caustic soda is another name for lye - find it with the plumbing in the hardware store.I made a hot tank from the bottom of an old electric water heater - see the GTV thread.
Is it ok to use the hot tank indoors, any concern with fumes? I have read that Caustic soda can be very dangerous to the eyes.
I wouldn't use it indoors. It steams and vapors would be basic (caustic). The lye comes in pellets and can be very concentrated until adequately diluted. Concentrated lye turns your cell membranes to soap so it feels slippery if you get any on your fingers - even after rinsing for a long time. And nobody wants a soapy eyeball. Use gloves and safety glasses. 1 kilo of lye pellets (NaOH) in 100 liters of water is reasonably dilute (about 0.25 Molar solution) so not super dangerous once dissolved. The effectiveness will decay as it converts grease to soap so you will need to add more lye as you go.Higher temperatures and concentrations are more effective. This one would only get to about 55-60C. It stripped off almost all the old paint easily and most of the grease. Most of the remainder washed off with a garden hose and scrub brush.Don't use it on aluminum - it rots away! It is for steel and iron, but brass and bronze can survive for a short time.While the lye can give you chemical burns it doesn't have toxic vapors and isn't carcinogenic or neurotoxic. Great information Shawn, thank you! I don't want to set up a hot tank indoors and its winter now so I don't see building one until the spring but I will eventually make one. I got a mid size floor model sand blast cabinet from our Canadian equivalent to Harbor Freight; Princess Auto for a half price sale of $200.00. I forgot how much I hate sandblasting and sandblast cabinets, have to keep the shop vac hooked up to the cabinet exhaust and running, combined with the compressor, even with hearing protection its loud and dust still drift around, I got about 3/4 of the bike parts sandblasted and then finished in the vapor blast cabinet. I will be glad when all the paint / rust is stripped and the parts sanded smooth.
Wow, that sonicator really does the job! Who makes yours and what size is it? I've always used phosphoric acid, but might have to try evaporust.From the looks of it Canadian paint stripper still works. Methylene chloride (carcinogenic neurotoxin responsible for work related fatalities) has been removed from US paint strippers and all they do now is soften the surface. The absolute failure of the stripper is why I made the hot tank and it is much cleaner and easier. BTW - pressure check your oil tank for leaks. If it is like the GTV tank, some of it is soldered and the solder joints may fail. Even my new oil tank had a weep where the oil supply fitting was soldered in.
I canít get phosphoric acid here anymore, it was such a great rust remover.
Can you buy "milkstone remover" at a farm supply store? The main ingredient is phosphoric acid.
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