Hand Tools Archive

good points
Response To:
Bullseye ()

Bill Tindall, E.Tn.
home made is, "It is faster drying, maybe a little harder, and has longer shelf life. "

The addition of the high boiling ketone and isopropanol definitely makes the Zinsser slower to get hard, for better or worse. It dries to the touch about the same but takes hours to fully harden in my cool shop. It certainly sprays better than pure ethanol formulation, but it is annoying when you want it to harden quick.

I looked up the patent for the Zinsser process to stabilize their product. The acid is extracted. This acid catalyzes ester formation between shellac components and the alcohol solvent. Remove it and the result stays useable longer, but not forever. What else the extraction does, for better or worse, I don't know.

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