powder coating/rust remover

https://www.harborfreight.com/10-30-psi-powder-coating-system-94244.html 

podwer coat paint: https://www.harborfreight.com/16-oz-powder-coat-paint-matte-black-93306.html 

除鏽：最好https://www.amazon.com/gp/product/B000BKC25K/ref=sw_img_1?smid=ATVPDKIKX0DER&th=1 其次https://www.amazon.com/Henkel-NAVAL-JELLY-Fluid-Ounce/dp/B000C016OC/ref=sr_1_2 

apple cider vinegar，citric acid，oxalic acid草酸，oxalic acid,  heavy duty acidic cleaner, 

買了 https://www.amazon.com/dp/B000C016OC 是膠體還不錯。