Aluminum pretreatment for powder coating
Feb 16, 2012·A. Aluminum Chromate under heat cured powder paint is a proven and acceptable pretreatment, HOWEVER, the chromate gel coating must be thin. The moisture left in a heavy coating will "out-gas" (sort of explode) through the powder paint and leave corrosion opportunities. Again, put the chromate on very lightly for bonding powder paint.