Conventional anodic coatings as specified in the contract, order or applicable drawings shall be prepared by any process or operation to produce the specified coating on aluminum and aluminum alloys. The applied anodic coating shall be uniform in appearance, free from breaks, scratches and other defects which wil reduce the serviceability of anodized parts. The coating shall be the result of treating aluminum and aluminum alloys electrolytically to produce a uniform anodic coating on the metal surface. The coatings, as specified in accordance with the contract, order or applicable drawing, shall be prepared by any process or operation to produce a heavy dense coating of thickness specified in 4.2. Dyeing shall be followed by sealing so as to meet the requirements of this specification.