Originally Posted by
bark_eater
I've used this a bit. Its pretty good good for derusting junkers with out disassembly. I brush Penatrol on after. I need to get the dilution and neutralization right, as I sometimes get a white "corrosion" with exposure to the elements.
When I pulled my fully stripped of paint Allez out of the ~5% solution overnight soak (now I know it was phosphoric soak!), it was very dull gray. I didn't have any white residue.
The shorter soak (and scrub) on the very cheap and not completely stripped made in China Fix8 didn't seem to matter.
Doing some short searches, to distract me from working...., I'm not sure what the white residue is - either from oxalic or phosphoric - someone on the internets indicated some kind of salts. Which may be why it needs to be removed before painting.
i need to post pics of my frames post paint - - as cautionary tails. Like I always told my kids when they caught me doing the wrong thing: "Even a bad example teaches a good lesson!"