It' not really the actual trimming that is the problem. it's making it look good instead of a jagged cut I'm making a jig to put the part in thenusing an Air grinder with a 0 flute bit to ut the thicker stuff out (like the glove boxes) and for the bigger side panel top pieces I'm having to revise the mold so a cutter has a built in guide to cut it out, the parts are great, it's just the operator of the machinery that has an issue :) this is the next one in line since the boss is paying for it, 1967 Lincoln convertible rear (in the trunk) wheel well smoother liners that go under the trunk liners