When using for Paint removal does it matter if it is synthetic?
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I build plastic car models and use DOT 3 non-synthetic. Also Easy-Off oven cleaner works, the strong stuff, not the enviro-friendly version. Some of the members in my model car club had success using Simple Green.
I've tried them all and finally settled on 91% isopropyl alcohol. IMO brake fluid is too messy and not easily disposed of, and I feel it dries out the plastic more than anything else I tried.
I also use a length of 4" diameter pvc pipe, long enough to hold a 21" passenger car body, and glue a flat cap on one end. Fill it with the 91% and dunk the piece in it until the paint starts to come off. Could be anywhere from 1 hour to 2 days, maybe longer.
I don't fool around with toxic stuff like brake fluid for jobs it was not intended for.
I use powered TIDE (has to be the powdered version) in hot water (almost boiling for tin, MUCH cooler for plastic) and have done so for many tears to strip all of my projects
Brake fluid is slow but works. Careful though, if it soaks too long it will soften the plastic. Keep checking.
I've had the best luck with 91% Isopropyl alcohol but has also used simple green for removing paint from plastics. Like Bob said, it could take from 1 hour to a few days so be patient.
Hard to find non-synthetic brake fluid these days.