However, commingling these wastes makes recovery more difficult or impossible and dramatically increases waste disposal costs. The onsite recycling of fluids is often a cost-effective pollution prevention option for larger shops. When onsite recycling is not cost effective, these materials can be segregated and picked up by a contractor for offsite recycling. In some instances, punctured aerosol spray cans and drained oil filter casings may also be recycled as scrap. Painting Operations .
Wastes associated with painting operations include unused paints and dirty thinner.
Thinners and solvents can also be sources of VOC emissions. Used spray booth filters are also waste products that may be generated from these shops. Proper training of employees and the use of high efficiency equipment can help reduce waste generation. The automobile industry is working closely with paint manufacturers to develop acceptable substitutes for solvent-based paints. In some cases, it may be possible to use water-based gun cleaners as an alternative to solvent thinner.