Listen to Justy...this rifle was finished in 2400 KG in Justy's garage, under his supervision. This was my FIRST experience using KG, but with a few tips i found it a very simple process. Some of the parts were simply left in the sun on a hot Las Vegas day, and were definitely hot enough to fascilitate the application of the GunKote.
The reasoning behind the preheating process is to just bring the metal to a temperature that will immediately fix whatever is being sprayed onto it....no drips or sags....just hot enough to handle with gloved hands. I am sure a hair dryer or heat gun would do the trick.
Justy has a dedicated small toaster oven in the garage that will fit an upper, lower and all parts necesarry to build an AR. The barrels are suspended and baked in a seperate galvanized tube (affixed with thermometer) that gets sat atop of a white gas camp stove....A little medievil...but works exactly as it should.
Anyhow, the finish turned out wonderful, and the process is simple as long as pre-prep is done correctly, and you have the right tools for the job.