@drkenb
you would also have to have your part completely degreased or you would end up revealing fingerprints. i believe the alcohol helps with a not perfect clean surface.
@luccas222 did you manage to fix the noise in the mean time?
@PUTV curious why zinc and not cornstarch?
- being that zinc oxide is 48um
- And corn stratch is between 10 and 30um (compared to talc powder at median 27um [variation 0.4-100])
since both are non soluble in all alcohol, does it have to do with the sun blocking (uv/ir) properties or just a preference?