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Oxalic Acid Powder to remove rust - what ratio/how long?

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griff:
so today was a day of swings vs roundabouts...

good news - the browny black mx copy calipers very kindly turned a nice shade of silver thanks to the magic of oven pride  :daumenhoch:
never tried that stuff before and couldn't believe how easy it came off

bad news - after spending hours on the F&F, trying various methods including hammerite rust remover (crap), stanley blades and metal polish, lemon juice and finally 24 hours of oxalic acid bathing (should have done this first) I got pretty much all traces of rust off. this would be good news, if it were not for the fact that I can now see daylight coming in through the seat tube near the weld. was only the rust filling the crack before

as much as I wanted to get this built up (was the frame I had when I was a kid AND I'm supposed to be racing on it next month) the cost of fixing the crack and the dents in it would almost certainly be way more than buying another one....

on a more positive note, I've learnt a lot about how to remove rust and got a good supply of peek/brasso/goddards cloth for any future jobs  ::)

oldtired:
shame about that tis the only problem with OA and sadly the problem with with the oldies  :'( :'(    having said that better to find out now than have it snap on you heading down the backside of the doubles  :daumenhoch:

for future ref although i'm sure you've figured this out i always spray the inside of the tubes with a tube protector and bung up the ends of the tubes, before dipping , you can also seal the tube with silicone permanently to prevent any further water getting in , seat post is a bit trickier need to seal it then remove the silicone after dipping use silicone remover then spry in the protector, or in my case useally just bung the seat post in forcing the silicone down to the bottom   :-X :-X  :LolLolLolLol:

griff:
was always a bit of a long shot considering the state it was in, but the only thing it cost me was time and chemicals so it could have been worse (hutchman kindly gave me the F&F so not like I'd forked out big money)
would defo use the acid again as it worked a treat on the rust without touching the chrome (also de-rusted my mtb seat clamp, some caliper springs and stem bolts  :daumenhoch:)

right - I need something to race on at MK now I have all the other parts and have signed up already, time to visit the wanted section  ;D

oldtired:
edit to above post  :daumenhoch:

DJL:
do you stat off with hot or cold water?  i know the water will obviously cool but does it need to be hot at first to get the process going?

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