PDFWAC 296-876-70005
Protection against corrosion and deterioration.
(1) You must paint or otherwise treat metal ladders or metal parts to resist rust and corrosion if they are:
(a) Exposed to the elements; or
(b) Located where rust or corrosion could be expected.
(2) You must treat wood ladders used in conditions where decay may occur with a nonirritating preservative.
(3) You must make sure wood ladders are not coated with an opaque covering except for the minimum amount necessary for identification and warning information which may be placed on one face only of a side rail.
(4) You must treat the interface between different materials or use other means to prevent:
(a) One material from damaging or having a harmful effect on another material; and
(b) Electrolytic action between dissimilar metals.