Quench Mud Stain

The red/brown staining is from the ‘mud’ at the bottom of the quench tank.  Usually if a piece is large and rests on the bottom of the quench tank, it comes into contact with this ‘mud’.  The mud can stain the surface.  This is unsightly and should be avoided, but is not detrimental to the coating.  A quick way to fix it in the field is to rub it down with a weak solution of vinegar and then a thorough rinse with fresh water. A light sanding of the affected area can also get rid of the surface stain.

brown, rust, dirty, stain

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