Yep, that's all you need to do. Mix up the epoxy and hit it with the heat gun. You'll see if thin out and start to run like water. Use and epoxy brush to start painting it the entire surface. Now bear in mind that even thoughyou are going to be working with 30-45 minute epoxy you will have nowhere near that amount of time to work with it before it kicks off and sets. There are two things that affect the cure time of epoxy, mass and heat. A mass of epoxy in a cup will set off quicker than if it's spread out. And heat will shorten set time as well. So when you start to heat it keep in mind that you may only have 10 minutes or less. If you have a bit area to cover you might want to break it up into several different applications.

Normally only one coat will be enough. As long as you brush it in well it should cover everything. As I said above, thinning it this way will cause it to soak deeper into the wood so you can usually use less epoxy to cover a given area. This is good because epoxy is heavy, and the more you use the more weight you add to the plane. One should be enough to cover, but if not you can always do a second coat.

Pull out a scrap piece of ply and take a practice run with this method. You'll see just how easy it is to do.

Ken