PC has better solvency than DAA, and it keeps resins in solution. With DAA the resins would sink to the bottom of the tanks. If a guy left a tool in a container of DAA overnight, when he came in his tool would be all gummy. The reason we didn't go with PC originally is that we didn't have the equipment to recycle it. I'm responsible for this stuff from cradle to grave, at Wellcraft and beyond, and recyclability plays a very important role.
Propylene carbonate is a tough animal to recycle.
We did finally find a way to recycle it, but the flow rates are very slow. We are in the process of purchasing new recycling equipment to improve the flow rate. As far as I know, we're the first boat manufacturer to start using propylene carbonate full scale. We figure everybody should be doing this. It's just so cost effective, I can't believe there is anyone out there still using acetone.