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Dave,
We
do not recommend that any coating of any kind be applied to the inner
surfaces of a leaf spring. The coating, whether it be paint or powder
coating, WILL wear off due to interleaf friction. When the coating wears
off, looseness between the leaves will appear. This looseness will allow
the leaves extra movement which can cause premature breakage of the
leaves or cause the center-bolt to shear.
The rusting between the leaves is a natural thing caused by the
interleaf
fiction.
Grease has an adverse reaction to spring steel which causes the
steel to degrade and weaken the spring, so we do not recommend using
grease/graphite between the leaves.
The appearance of rust is something
that
has to be lived with. See what I had to say about Painting
vs. Powder Coating vs. Chroming springs.
-Mike
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