3.3.5. DI Water Sealing: Unless otherwise specified, anodic coatings referencing this specification shall be sealed in hot DI water bath. The use of nickel acetate for sealing is prohibited.DI sealing process control shall include, but not limited to, the following:• pH control:The sealing tank pH is controlled via close loop auto feedback with SPC.• Temperature control:DI tank temperature is controlled automatically with upper and lower controlled limit well defined.• Sealing time: One hour per mil of anodize thickness.