ive just installed a deck in my back garden using tanalised timber, i know its treated but i would still like to treat it again but unsure what to use. our lass wants to keep it the same colour so what do i use stain or oil? spoke to 2-3 people whove spent 30quid or more on stain and the stain has all crumbled off.. any ideas just want to keep it the same colour and know that its sealed. any help appreciated thanks