My My recommendation would be to magnaflux your components before powder coating. Most powder coating materials that I have used are thin enough and brittle enough that you will have cosmetic issues with the powder coating if you have stress cracks or excessive deflection. Motorcycle frames, drag car (funny and top fuel) frames are frequently powder coated because it takes a lot of chemical abuse, looks good, and doesn't have the inherent process induced stresses caused by electroplating (think chrome).
Another el-cheapo powder coating system is to find a used commercial gas oven and vent it properly; better and more uniform temperature control as well. With the right oven, you could even powder coat an engine mount. Mark W. N952MW (res) In drag racing frames and roll cages are not painted or powder coated on the professional level. you need to see in defects and it adds weight to the car. Top fuel, funny car, pro mod etc. frames are cleaned with brake cleaner and wiped down with oil.
