On Wed, Mar 6, 2019 at 01:48 PM, Bill Carns wrote:
I this context IPA = isopropyl alcohol (just so I am on the same page.)
My claim is that if you, very broadly separate, finishes into "modern" and "classic", IPA probably only dissolves "classic finishes." The reason I am saying this is because those "classic" finishes: paints, shellacs, and lacquers: they were based on the naturals secretions and saps of insects and trees. Whereas, "modern" finishes are based on synthetic materials. Very generally, many "classic" finishes will be affected by IPA: for instance, natural shellacs; because alcohol (methanol et. al.) is used to dissolve the secretion, to make liquid shellac. More "modern" synthetic finishes, are much more resistant to IPA. (90% IPA is often used to wipe down surfaces, and objects, to kill bacteria.)
I'm interested in hearing about IPA dissolving paint. I haven't been able to duplicate that.