Lawson and Ulano suggest you consider modern synthetic indirect films like Ulanolux and Pulsar. Blue Poly-3 is a tried and true workhorse. It is a blue, medium thickness gelatin-based film coated on a 3-mil optically flat polyester backing. Same as Blue Poly-2, except for the thicker backing, which means more dimensional stability and easier handling of large stencils. Slightly less resolution than Blue Poly-2. Resolution: 87 - 112 microns (3.5 - 4.5 mils). 207-254-3-RL 40"x300" .............. $143.25 Other sizes available upon request - Please call 1-800-325-8317