A seal coat plus a flood coat per System Three recommendations yields approximately 70 mils of thickness or a fat 1/16". This thickness can vary slightly depending on substrate porosity.
If an ultra-thick appearance is desired, additional coats can be added. No sanding is necessary if the prior coat was applied within 72 hours. Beyond 72 hours sand with 150 grit sandpaper. Add MirrorCoat at 4 fluid ounces per square foot.