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I've been stripping some second hand Dark Eldar models using oven cleaner, Mean Green, and a lot of elbow grease, and I'm finding that the models are now a little corroded. Will the corrosion effect how the paint bonds to the surface? Should I polish them down with metal polish and a toothbrush?
I think that the corrosion will probably make the paint stick more, actually. But, what you describe might be an effect of using a spray primer too.
What works for me with paint stripping is several hour long dip in an alcohol-based solvent (nearly 99%, IIRC), and cleaning up with an old paintbrush and some toothpaste afterwards. This never gave me any damage or corrosion, no matter plastic or metal.
just out of interest what does the coroded model look like?
That is a good question - I have never seen a miniature corrode before. By corrode I mean something similar to a rust buildup you see on iron. I have seen miniatures discolor and brown over time. I have some old old miniatures from the early 80's that have a darker tinge to them due to oxidation over long periods of time but nothing like corrosion. If it is just darkening in color - I have never had a problem painting over it.
If possible - might I suggest taking a picture of it and showing us?
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Is it real corrosion or just light surface oxidation? I'd have thought you could get rid of the latter by leaving it overnight in a weak acid solution.
"It fits like clothes made out of wasps!"
It's almost more tarnish than corrosion. The surface of the models are no longer reflective and appear to be very finely pitted, much like a bead-blast finish on the blade of a pocket knife.
My first thought was that the metal was discoloured by primer, but the original painter didn't use any. He didn't basecoat them either, and rather than painting the blades on the models, he just left the original pewter exposed.
I've tried using Metal-Glo on a model I don't ever intend to use, and while it did brighten up the flat surfaces without removing detail, the polish is rather goopy and it's nearly impossible to wash it all out of the fine details of the model. I'll try Phobos' suggestion and dunk another model in a diluted vinegar and see if that helps.
What you describe sounds to me exactly like the normal way a metal model looks after stripped, without the sheen given by the release agent on the fresh-from-blister ones. This so-called "corrosion" will not affect the painting in any way, nor will it show through.
Mean Green doesn't have any abrasive elements, does it? A lot of oven cleaners will have some grit mixed in to help with the scouring. That plus elbow grease could cause the kind of pitting you describe.
Maybe try a brake fluid or Pine Sol test on another mini to see if you get the same kind of pitting?
break fluids is good, but try leaving it for a day or to to have better effect on moving the paint, if you panning to strip it, also get your girl friends nail polis remover and if you dont have one get your moms or your nannas (luv the word nanna)
for plastic models you brake fluid, since ethanol or methenol base solutions will eat away the plastic.