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The rundown is this; the other night I botched a paint job on a cairn wraith. So I went online to learn how to strip the paint off of him, got the materials, let him soak over night. Now as I get home from work, ready to brush the old paint on him, I discover that the stripper (simple green) did a wonderful job of taking the paint off of him. Except the undercoat. Its a bit funny, but I keep turning him over and over. Not a chip in it. Not in the rust marks on the scythe, not under the hood or cloak, not on the base. The undercoat seems to be perfectly intact.

The question is, is it ok to start from this point again, or should I keep him soaking to take the undercoat off. Please note that there was never a problem with the undercoat.

As long as the undercoat seems to be dry and has no ill effects once painting starts, I'd say try it out and keep it. Or you could go the safe route and undercoat it again. Hopefully lightly, so the details aren't obscured

If the undercoating wasn't at fault and is intact, you can start from this point again. No point removing more if you don't have to.

Sounds like a spray enamel undercoat or proper primer. SG won't touch either of those. It's fine on acrylics - but hell, methylated spirits (ethanol with 5-10% methanol added) will strip acrylics.

If the undercoat looks fine, you could just run with it. I'd be slightly worried that the simple green soaked in to the undercoat and ruined it's properties or will affect subsequent layers of acrylic, but if it looks fine, I suppose go for it.

I have been in the exact same situation.

Certain undercoats are not affected by Simple Green.

Just follow the method for any stripped model and wash it throughly with water afterwards -> let it dry and its fine to paint over the undercoat.

I have an entire squad of SM that I did this to and none of them had/have any issues.