Rainkote® NC is an additive to prevent line-stop stain in the rinse section of hydrochloric or sulfuric acid pickling lines. It is an acidic product possessing corrosion protection and wetting. It is designed to eliminate brown or reddish stains often experienced on the steel strip exiting a continuous pickler. It eliminates the formation of iron hydroxide slimes which accumulate in rinse tanks as a result of acid bath carryover.

Due to its non-chelating components, it is compatible with waste treatment processes where removal of metals like iron, copper, zinc, and chromium must be accomplished to meet limits for effluents.