If by normal fence paint you mean creosote substitute that should spray OK
as it is. It might be worth filtering it in case there is any debris that
could block the hole in the sprayer's jet. Surely if you dilute it with
anything other than a preservative then its effectiveness as a wood
preservative will be reduced. And if you dilute it with a preservative then
it will cost as much as the undiluted paint in the end.
I have only used B & Qs own brand fence preservative as is in my sprayer, I
haven't tried to dilute it. You could try diluting a small quantity with
water and see what a small test area of fence looks like after it has dried.
Obviously the final colour and preservative ability will not be the same as
using it neat. If you are planning to stay at this property then diluting
fence preservative sounds like false economy to me if it results in the
fence needing painting more often or the wood rotting sooner.
I have used neat Creocoat, ( Creasote substitute) with my compressor,
initialy I used the spraygun, however this was so fine & slow, I tried the
degreaser gun & found it ideal for doing fence panels faster than that bloke
on the telly advert.
Why not use Thompsons water seal, It sprays easily from a garden spray and
is only 8.99 a gallon from B & Q. It's made for wood, brick, fabric. I
used some last week on an outbuilding made from breeze block. Try it you
won't be dissapointed. It's clear stuff though so if you want your fence a
particular colour paint it first with whatever and then spray it with
Thompsons water seal.
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