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Not cut lapping, zipper cutting. To all you long time glassers :-) do you find zipper cutting is easier with poly? Have gone completely cured, close to completely cured, and further back, and the cloth doesn't like to 'crease' at the edge of the tape. Cut lapping no problem (epoxy). Zipper cutting lifted lap edge. Am I simply not opening up enough before zipper cutting? More onto the straights before lifting the tape? Any doubts fresh blade :-).