Vibrating them through your planer will shake out a lot of interior
substance. My fence boards were bare, as they should be. I wouldn't waste
my time with anything else, if it were me.

"Gino" wrote in message
...
Would a splash of UV protected Thompson Water seal help protect them and
maintain the color.
I can always unscrew them a run them back through the planer in a year or
two.
I did this with another fence using old planer blades to just remove the
grey
and it worked pretty good and took very little time (except the staple
removal).
Made the old fence look like new. A few warped boards were a problem but
most
were great.