Your best bet would be to call the manufacturer and see what they recommend to break it down.
Vehicle was coated in overspray. It's a 2-part polysiloxane (PSX700) which has cured and is well adhered to the vehicle surface. Clay bar did nothing. The drops can't be scratched off with a fingernail either. The bond is very good.
Anything short of wet sanding?
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Once my Alfa Milano had a mist of paint from an overpass painting project stick all over it. I tried acetone, lacquer thinner, credit card scraping, nothing worked. Some droplets came off with a fingernail, but most seemed permanent. Even if I could have enough fingernails to do the whole car, it would have taken months. I -literally- nearly cried. NOTHING would touch the ****, and I thought I'd have to sand and repaint the entire car, which had like-new paint hours before. As a last resort, I tried Meguiar's clay bar and it worked. Used it with their quick detailer for lube (I think they now have a spray for the clay ).
I was amazed. Left no marks at all after a wax. Hope it works for you.