Quote from the manufacturers website
"It may be applied to wood that has been previously treated, or treated with
Creosote provided it has been allowed to weather. Sprayable Fence Treatment
is not recommended for use on smooth or planed wood, decking or garden
Wonder why is not recommended for smooth / planed wood?
It's not easy to get that kind of stuff soaking in in my experience. The
rougher the surface the better. And it leaves a residue on the surface that
comes off on your skin/clothing, which is why it's not for decking etc.
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