Anyone have experience with Soy Gel paint and urethane remover? Made from 100% soybeans and I guess without the same level of toxicity of other paint strippers. They list 'automotive' as one of the applications, and also state that removing paint from metals is part of what it does. It gets great reviews from non-bicycle folks, so I'm curious how it'd fare in stripping a frame. I think I'm going to purchase a smaller amount to see how it works on my steel bike. Downside is that it's more $ than more toxic paint strippers. But we'll see how it turns out.
I bought the quart size about a year ago to try on some window trim -- not on metal. The old wood had many layers of probably lead paint on it. It didn't come off as smoothly as I'd hoped, but it did a decent job, I guess. One thing, though -- the resulting stripper/paint slurry seemed to get more dense with time as I used a scraper along with the stripping. There is still traces of the stuff stuck to the handle of my yard faucet. I'll probably buy some more for use on the house, though.