Stone-Veneer can be applied to MDF, HDF boards, styro foam sheets, melamine, brick, concrete blocks & slabs, mortar plastered walls, drywall, plywood, acrylic or plastic sheets ( Translucent). In some indoor and most outdoor applications expansion and contraction must be equal to prevent delamination. A flexible adhesive may be considered in this case. Concrete and masonry substrates must be at least 28 days old. Hydrostatic pressure conditions and vapour transmission cannot exceed 3lbs per 1000sq ft. / 1.36kg per 92.9m2 per 24 hours using a calcium chloride test ( Ref. ASTM F1869) and retained moisture should be less than 2.5%.