You can try Tego chemie's "Foamex 810 ". Actualy it is not recommended for epoxy systems, but it works-----
176.4583/thickness of the coating, in inches
By thick control.
There is many companies that produce coating thickness gauges, for example there is Blue technology, Defelsko, Grainger, and Elcometer just to name a few.
Isoscope or Fischer scope
Total coating thickness, after drying of paints.
2 milli meters
After you spray something with a water based coating you should spray over it with polyurethane. This will make the bubbles not come up and the surface you have just sprayed stay smooth.
Coating is applied between "metering" rolls that when moved together or farther apart "meters" the amount of coating applied to the composition roller. Pressure of the metering rolls against the composition roller and pressure of the composition roller against the scraper roll will also affect the thickness of coating being applied.
Epoxy-polyester powder coating is a hybrid of epoxy and polyester powder coating, and galvanised is coating thickness for steel bars and components is between 3 and 4 mils.
http://wiki.answers.com/Q/What_is_the_voltage_can_be_used_for_holiday_test_based_on_coating_thickness_and_what_is_reference_code_for_this"
The chips with air bubbles seem more salty because when they are coating it with salt they roll in a giant barrel really.. the finest salt particles can fall in and get trapped inside the bubbles
An ultrasonic thickness gauge outputs ultrasonic waves which are reflected off a base surface. The resistance caused by the "coating layer" is measured by the magnitude of the returned waves. This resistance is used to determine a thickness measurement.