Foot powder trick works because the powder settles into cracks and shows the oil seep. Try it on exhaust manifolds too, cracks show up fast that way.

Switched to flex: 0 0 300px on my last project and never looked back, basis finally did what I told it. Also learned the hard way that height: 100% on a flex kid is just asking for a bad time.

Three days?? That smell is never coming out, it's fused to the neoprene at this point. Try vinegar soak overnight then air it out for a week, that's the only thing that ever half worked for me.