... Use the automatic punching machines, skid-proof, water-proofPaintingUse the painting flow line machine,well-mixedCertificateTUV EN1176, CE, SGS, SASO, ISO9001 Safety ... durability Pretreatment and curing process includes: acid wash, freshwater rinse, iron phosphate, final rinse, seal, dry-off oven, electro-static powder ...