@DPellegrino @thejoyofsticks It's very unfortunate if your state has it banned, there is nothing that works as well for ABS. I have moved around and lived both in states where you couldn't get it and ones where you could. The first time I bought it was at Home Depot, but now they don't carry it even in states where it is perfectly legal. I've had to buy it online since then.
I usually use it outside, the easiest ventilation. It's harsh toxic stuff, but I haven't had any issues with it.
You can also sometimes find small cans of a liquid ABS/MEK mixture. That stuff is awesome for filling cracks that are actually missing plastic. But I've only seen it come in a couple colors, mostly black. Now I am saving some shattered pieces of a partial ST case in case I need to melt it down to use on another one.