hello i do dip them in proper coal tar creosote its good stuff!! i do mix in some diesel and old engine oil it makes it go farther.i think it wants to be a bit more than 30p for the hassle its a bit of work.I put them in the shed to dry out then i dip them for a few days then put them in another barrel to dry then i stack them in a stillage.I was thinking it wants to be at least 50p to a £1