In article o.uk, Dave
Liquorice writes
On Mon, 11 Jul 2011 09:55:38 +0100, BartC wrote:

what's the best stuff to paint/treat them with?

I quite like Cuprinol 5 star or the Cuprinol stuff that doesn't
include the worm protection. Both are a paraffin like carrier rather
than water and I feel it pentrates better. With posts I'd stand them
in a couple of inches of the stuff for a few hours and apply several
liberal brush coats until it doesn't soak in after 5 mins. Also
paying particular attention to the section of timber that will be a
couple of inches below ground level to a 6" or so above. This is the
region where a wooden post will rot if untreated.

Drill a 6mm hole in the post just above ground level and sloping
downwards at 45degrees. Fill it with Cuprinol once a year and plug the
hole with a short bit of dowel. Post should last for ages.
--
Chris Holford