My 99% isopropyl alcohol arrived earlier this week and I have been
trying it as a carrier for boric acid in fire coat solution. In my
opinion it is not an acceptable substitute for denatured or pure
ethyl alcohol. It will hardly dissolve any boric acid into solution
so it leaves a virtually non exsistant coating of boric acid on the
work resulting in excessive oxidation of the work.
My recommendation is to stick with denatured or pure ethyl alcohol
for use in fire coat solutions.
James Binnion Metal Arts