After the primer has dried, or at least become tacky, it shall be followed by a coat of bituminous enamel, applied hot. In any case, bituminous enamel shall be applied within 24 hours after the primer is applied. Long drying periods result in lack of adhesion of the enamel. The enamel shall be applied to the lower surfaces first, as it has been found that in coating the upper surfaces first, drippings and streamers there from cause difficulty in the proper coating of the lower surfaces. The enamel shall be applied along the lower edge of the bulkhead bounding angles, boiler and machinery foundations, and other metal work projecting through the enamel, in order to completely coat the angles.
Special care is necessary, therefore, to insure that the entire surface is coated with enamel.
Bituminous solution is intended only as a bond between the enamel and the metal surface. It is not a protective coating and therefore shall not be used as such. Plastic compositions for tanks. The reducing kettle should be as close as possible to the place of application to avoid heat losses in transferring material. The material at 400 degrees F. is drawn off as needed into insulated gallon paint pots and is immediately handed into the tank for application.