Hi i'm looking at the fire retardant treatment. Can it be applied to machined timber that has a mill glaze? What paint or lacquer can be applied on top for decorative purposes? When applying a decorative coating does this effect the fire rating?
Zeroflame Fire Retardant Treatment would not be suitable for this application due to mill glazing sealing the pores of the timber.
Thermoguard Fire Varnish BS Class 1/0 & EN Class B System could be used to achieve a class 0 level of fire protection assuming the timber is throughly dry and abraded prior to application.