The most common problem I hear with DIY powder coaters is "MY POWDER ISN'T STICKING TO MY PART!". More than likely it's because of a poor ground. My POWDER COAT GROUNDING ROD INSTALL, WHY?...AND HOW TO! video will probably help...ALOT!!
CYCLE FAB :    / cyclefab  

LINKS to my DIFFUSER KITS
EASTWOOD Diffuser Kit: https://www.ebay.com/itm/125686625341
HARBOR FREIGHT Diffuser/Mixing Tube Combo Kit: https://www.ebay.com/itm/125002819173
HARBOR FREIGHT Diffuser Kit: https://www.ebay.com/itm/124837009589
HARBOR FREIGHT Mixing Tube only: https://www.ebay.com/itm/124960721797
FAN NOZZLE-HF1 for Harbor Freight: https://www.ebay.com/itm/125161692424
FAN NOZZLE-E1 for Eastwood: https://www.ebay.com/itm/125161727758