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Author Topic: Celluloid Crack Fusing Repair  (Read 754 times)

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odonovanchris

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Re: Celluloid Crack Fusing Repair
« Reply #20 on: June 29, 2020, 03:41:52 AM »

Put a mm or two of pure acetone in the foil tray, then put your piece of celluloid on the little raised platform and put the lid on and leave for an hour.
Be sure to check it every 10 min or so, ambient temp has a big effect on how fast it softens.

If the damaged area is small take a old nail polish jar and dissolve your piece of patch material in a mixture of acetone and a bit of lacquer thinner, it will take a couple of hrs to dissolve. Paint a layer on the crack, paint a layer every 12 hrs till it is a bit high. Let this dry for several days, if it is a corner use a jewelers file to smooth it ,flat areas can be done with a small piece of wood with fine 1000 grit sand paper glued to it, use a bit of water to keep the area wet or the paper will instantly clog.
you can chemically smooth it with a quick swipe of a brush with acetone on it, this will reveal bubbles in your finish if you got in a hurry with the painting of layers.
 if you have a piece of celluloid you can put a couple of drops of acetone on it and after a few seconds scrape off the softened material with a knife and use the blade to pack the paste into the damaged spot. you need to work fast and then give everything some time to harden before the next step.
 The celluloid will shrink as it dries so don't final sand or polish it for a week or grooves and dents will show up after a couple of days.

Thanks for the detailed reply. Great tips.
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RogerT

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Re: Celluloid Crack Fusing Repair
« Reply #21 on: June 30, 2020, 02:56:40 PM »

Big thumbs up to Kymric's wet n dry suggestion (I once spent a summer working in a crash repair shop...dunno why I hadn’t thought of this before). Indeed, block of wood + 800 grit followed by 1200, with dabs of lube water works v well.
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