the thickness of wet paint (liquid) on a solid surface.
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A micron is one millionth of a metre.
A screw gauge is used for this purpose.
A gsm is a measure of mass per unit area while a micron is a measure of length or distance. The two measure different things and, according to basic principles of dimensional analysis, conversion from one to the other is not valid.
1 micron > 0.5 micron
You don't, because they're different types of units. Microns measure length and grams measure mass.