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Would shellac work or traditional lacquer[0] work? They both cure by drying, not polymerizing, and can be removed decades later with the original solvent: alcoh
by mauvehaus 6y ago
Would shellac work or traditional lacquer[0] work? They both cure by drying, not polymerizing, and can be removed decades later with the original solvent: alcohol in the case of shellac, or lacquer thinner in the case of lacquer.
I haven't had any experience with lacquer because traditional lacquers almost have to be sprayed, which I am not equipped to do. I have plenty of experience with shellac because you can brush it and get a pretty decent finish off the brush, or French polish for a more refined finish. French polishing takes advantage of the aforementioned properties of shellac: besides laying another thin layer down, you're also redisolving the existing layers and smoothing them as you go.
Traditional varnishes cure by polymerization, and generally cannot be removed with mineral spirits. That isn't to say you won't ruin the finish trying, but you'll need a different solvent if you want it gone cleanly.
[0] lacquer has become an almost meaningless term. There are products that might or might not technically be lacquer that are called lacquer or water borne lacquer or some other phrase that includes the word. I'm referring to the stuff that uses lacquer thinner for the solvent. You'll know it if you smell it: it smells like it's giving you cancer right now, not in 30 years.
- beervirus 6y agoShellac ought to be fine. Alcohol isn't going to cause problems for any of the components when you remove it, but lacquer thinner seems like it could.
- derefr 6y agoMind you, in this case, we're talking about something that 1. doesn't have to dry clear (and in fact can dry entirely opaque), and where 2. it'd be much better if you could remove it by peeling it up, rather than by using a solvent, because many of the components have plastic housings that don't take kindly to, well, any strong solvent really. The goal isn't an art piece — it's to create a barrier to moisture/corrosion for a board within an unlit box. If you want to do a repair, you'd entirely remove this layer before doing it; and entirely reapply it afterward.
- kelnos 6y agoHow hard would the peeling be? I'd worry about ripping off components or even board traces if I had to peel something like that off it.
- jmuhlich 6y agoShellac has nearly zero resistance to water vapor so it wouldn’t prevent corrosion at all. Nitrocellulose lacquer isn’t a lot better.