ive used the harbor freight gun for years and at $50 and basically free replacement at anytime policy. a lot of ovens have the ability to use Propane or Natural gas which is way cheaper than electric if you get addicted to powder coated everything you own as for powder, i go to my local powder coating shop and buy from them usually costs about $5/lb. They dont like to use powder thats more than 6 months old where i go and usually will give me that stuff free by the boxes ! sandblasting is not necessary but having a clean surface is. sandblasting is just the most efficient way to clean and strip metal items that are nasty or painted.