Sorry for not explaining better. The 1500 micron (1.5mm) id the dry film thickness (DFT) and this is measured after full curing time has elapsed. The wet film thickness (WFT) is much thicker during application. The best way to decide if you think you are putting too much on with a brush is to apply the heaviest even coat you can in a horizontal stripe on a vertical surface and see if it sags in the brush marks. If it does, just back off a bit with the thickness until it doesnt sag, then you will have a good rule of thumb to work with.
You will be surprised how thin paint is when applied with a brush. The industrial painters i oversee can do brush work quite accurately to gain 300 micron over a couple of coats.
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