Mac's: I have been using Gunkote for about twenty five years and use it exclusively as the final coat in our Tuff-Gun 1 finish. We're so confident of Gunkote that we offer a lifetime warranty against rust on our finish.
Metal preparation is the key to making it work right. The rattle cans are junk, use an airbrush. An internal mix brush will give a more consistant spray. The stuff is not healthy to breath so use a respirator and plenty of ventilation. I do a lot of it at once so my spray bench has a huge power ventilator hood over it. The curing vapors are very harmful and some of the colors contain lead. If you insist on using the kitchen oven to cure it, use lots of ventilation and scrub the oven out afterwards. The vapors will settle on the oven surfaces and then transfer to other surfaces like food when it's heated again.
Time and temperature for curing are critical. Too long or too hot will make it change colors. To short or to cold will not allow it to cure fully. Also, open the oven every 10 or 15 minutes to vent the curing vapors. This helps to keep them from settling on the parts.
Our curing oven uses electronics to keep the temp within 2% of what I set it at and the duration precise. It's also a recirculating oven so the air is always moving a lot and getting a little exchanged.
Keep yer powder dry, Mac
Tuff-Gun Finishes. The Name Says It All.
Mac's Shootin' Irons