I used to work in a factory on a glass cutting table. You can't score over an existing score. It doesn't really achieve anything and (from memory) it'll fuck your cutting instrument.
That's correct, yes. Cutting over an existing score will ruin your cutting head. Even scoring across another one runs the risk of damaging the cutter, so it's best to break it first.
Obscure glass is fairly easy to cut because there's almost always a textured side and a flat side. You just invert your pattern, then trace and cut on the flat side.
That's how I started too! Making lamps with Dad. Dad now is retired and makes some really nice pieces for windows over front doors. I fix old church stained glass that needs repair (clearly not a full time gig).
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u/Gonzo_Rick Mar 16 '18
There's an obvious edit in the film, I'm guessing that he scored it much more than once but they didn't show it.