How to keep dye off of plastic trim? - Woodworking Talk - Woodworkers Forum
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post #1 of 7 Old 11-23-2017, 10:19 AM Thread Starter
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How to keep dye off of plastic trim?

Iím getting ready to dye a banjo resonator using TransTint dye dissolved in denatured alcohol. The banjo resonator has white plastic trim on the front and back edges. The trim is made of ABS.

Iím keen to keep the dye off of the white plastic trim during multiple dyeing sessions.

Iíve thought of tape, but Iím not convinced that tape will work all that well since the dye is thin and solvent based.

I also considered putting shellac on the plastic trim to protect it, but it seems that the alcohol based dye will at least partially dissolve the shellac making it ineffective.

Any other ideas or advice? Is there a tape that works effectively in this situation?
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post #2 of 7 Old 11-23-2017, 10:25 AM
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What most Luthiers do is to apply the dye and then scrape the binding clean. You can also apply some lacquer to the binding since the alcohol won't dissolve that. Then when you scrape you'll have a nice and easy time removing the lacquer. And yes, it will probably bleed under the tape but that would also limit the amount of scraping you'd have to do if you want to go that route.

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post #3 of 7 Old 11-23-2017, 11:01 AM Thread Starter
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Yeah, I know luthiers scrape, but they have talent and patience!
Iím thinking thereís got to be a better way or a better tape for the un-skilled like me!
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post #4 of 7 Old 11-23-2017, 07:18 PM
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Can you post a picture?

You are correct to worry. The dye stain mixed with alcohol would easily run under tape if you mask it off. At this point the only idea I have is to mix the dye with water instead of alcohol and use frog tape or other paint block tape to mask off the plastic part. I imagine in the factory the wood is stained and finished before any plastic parts are installed.
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post #5 of 7 Old 11-23-2017, 09:48 PM Thread Starter
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Hereís a picture of the future scene of the crime.
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post #6 of 7 Old 11-23-2017, 09:53 PM
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Better use an oil stain. A dye will stain the plastic too. Even with an oil stain it wouldn't hurt to mask it off.
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post #7 of 7 Old 11-27-2017, 11:25 AM Thread Starter
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In case itís of interest, I used 3M 24805 tape and had almost no leakage of the dye onto the binding. The few places were it did sneak under could probably have been avoided if I had made sure the edge was pressed down tight. This coat of dye was pretty wet too. The next coat will be much drier, so Iím hoping for completely clean binding afterward.
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