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acrylic plastic sheet P2 question

I recently had a question from one of our haz waste inspectors regarding P2 opportunities at an acrylic plastic sheet manufacturer .  The sheets are used in optics applications. This manufacturer flow coats the sheet with a resin several times before treating it with UV light.  The flow coat solution is approximately 70% isopropyl alcohol, a small portion of resin, and the remainder of it is PM glycol ether.  They have been re-circulating it and re-using it until it is too contaminated to use.  Then it is disposed of as a hazardous waste.  They are interested in options to extend the re-use of this flow coat.   
The company has looked into distillation but doesn't think it will work with the blended solvents. I believe filtration is an option.  Has anyone else been to a company similar to this and seen other opportunities or specific technologies applied? Thanks
Helen Miller
Environmental Specialist
Division of Hazardous Waste Management
Ohio EPA PO Box 1049
Columbus, OH 43216-1049