WTF is this orange crap?

Our pan filled up with water again, shutting the AC off. But WHY is it orange water? And with a film on top. After sucking it out there’s like orange sludge in the pan and it smells like paint. What is this and what do we do to prevent this? Florida Unit in garage We have 3D printers in the garage but that resin isn’t orange and doesn’t smell like paint. Help!