White Chemical WR-9 can be used in its concentrated form or in a dilution of one part WR-8 to 10 parts water, depending on the severity of rust to be removed. WR-8 can be wiped, brushed or immersed for faster results. It should remain until all rust and water scale are removed. WR-8 is used to remove rust from equipment prior to painting. It may also be used to pickle metals such as galvanized sheeting so that the paint will adhere. Heavy scaling rust must be sandblasted. The resulting black spots (core or rust) on the metal will become the problem area if not treated. Point life will be extended 2 - 3 times if a solution of 1 part WR-8 to 10 parts water is wiped or sprayed over the surface. Allow reaction time of 1 hour. For light or surace use, apply product diluted 1:10, for medium rust and water scale, apply product 5:1, for heavy use, apply 1:1. Reaction will be complete when color changes from rust to gray-black. This gray-black color is iron phoshate. Iron phosphate is a non-metallic, stable compound wich paint will adhere to better than new metal. For galvanized surfaces, dilute WR-8 with 5 parts water. Allow surface to dry and paint.
If the surface to be cleaned and conditioned has large amounts of dirt, oil or grease, this should be removed with WHITE CHEMICAL WR-5 or WR-80.
