hi. Acquired some ply (new) which i want to use for some platforms in my loft but i am concerned that in the very unlikely event it may contain some kind of rot > i would not want this being transmitted to my own timbers up there. what may be could i paint the timbers with before i placed them down on the existing joists. and would it be best to coat the new and the existing timbers before laying down. any advice would be welcome as i would rather trash everything rather than give my self problems at a later date. thanks bob