We used to paint the equipment we make until I started testing powder coating at our shop. We had a regular size oven until recently when I made a new oven. This is the powder coating oven I made from 2 ovens. I got both ovens for free, someone threw away one oven and the other I removed from a friend's apartment complex after they got a new one. I took them totally apart and then cut into the sides and made one large inner shell by welding 16 gauge plates in between. I reused the insulation in both ovens and put extra insulation in the tops and in the door. For the door I used one large sheet of 12 gauge steel and welded 1 inch square tube together to make a frame and 20 gauge galvanized riveted to the outside to make it lighter. I used one set of controls and moved the broiler element to the right side bottom. In a regular oven only the bottom element is used to cook unless you have a preheat or broil function in which case it will use both elements. I have used this oven 4 times now since I made it to powder coat some very large things, it works great. There is now 50" of clearance so I can use it to paint 4' long items. At the bottom of the oven is a cart I made which allows me to roll it around and it is high enough so you don't have to bend down when putting things in it.