I have not used Guncoat but have used Brownell's Teflon/moly and baking lacquer. When baking you are to suspend the parts, I used wire to hang from the oven rack. One word of caution you should not use the same oven you use to cook food in as these finishes put out toxic fumes.
These finishes are much more durable than any bluing and if done right aren't much differant than stainless.