I'm 3D printing a Darth Vader helmet and assembling it out of multiple pieces. I bought a small bottle of polyester resin as part of a standard body patch kit, the fiberglass will be used to reinfoce the joints in the assembled piece. I also picked up a tub of microspheres to mix in for sandability and weight reasons, that stuff is fun, haven't used it since my aircraft maintenance training. Figured I wouldn't need a big container just to play around with it for a costume, however the stuff is pretty pricy per oz. Anybody know of good suppliers of resin and microspheres that won't break the bank per oz. but have good quality? I also noted that the resin is now brown instead of the stinky green I used to work with in those kits...did they switch to a low VOC formulation? It's nowhere near as obnoxious as it used to be.