I've previously been able to get hold of the dark green coloured concentrate at Bunnings (my local hardware store), and had found it to be extremely potent at removing years worth of paint- thick, thin, undercoated or no- it all came off with some time submerged in it. In no way did it affect plastics, and didnt even un-stick previously superglued parts- its extremely good at what it does.
However after I finished my last bottle I found that Bunnings had stopped stocking the dark green concentrate, and all I could find was a bright orange concentrate instead, which is easier to see through and has a orangey/citrus smell to it. After some google searching I couldnt find any real evidence either way to say if it was the same thing as the green concentrate, or even as potent/unharming to plastics.
So, with a bottle of newly purchased "Simple Orange" I threw my old Azrael mini in as well as a surplus plastic space marine, and waited for two days. And the results? After a quick high-pressure blast from the garden hose all the paint is gone from both minis!
So, there is absolutely no difference from the dark green stuff in regards to performance and treatment of plastics. And even better, you can see right into the concentrate to view submerged minis (check paint stripping progress) whereas the old dark green stuff would obscure your view. So, win win!
For anyone looking for this stuff, its bright orange, and comes with a spray bottle shring-wrapped beside the main 2L concentrate in a 'pack', for $20AU. Cannot recommend highly enough. Also, to allay any fears people may have, ignore the 'dont use on plastic trim' comment on the bottle- doesnt apply to the plastic used in miniatures!
So to round this post off, here's some of my tips for using simple green/orange/whatever..
- Use a cheap plastic see-through food container with a snap on lid. If left open to the air the SG will evaporate over time, as well as lose its colour and turn clear like water. Not sure if this changes its paintstripping abilities though. When enclosed it will holds its colour and level almost indefinately.
- Blast minis under a tap or garden hose to remove paint (within reason- delicate stuff would be better lightly scrubbed with a toothbrush), then dunk in fresh water for a while. Remove later and let dry in the sun.
- For really thick paintjobs its best to scrub whatever you can get off with a medium stiffness toothbrush then drop the mini back in. My Warlord Titans took three extended baths to get the paint off, although this was mainly due to them having enamel paintjobs- SG is better suited to water-based acrylics, but most solvents that are good for enamels are no good for plastic.