Stormguard Secondary Glazing Film - 12m2 A simple, cost-effective way to draught-proof your windows, this transparent glazing film can be fitted over the entire window to prevent warm air escaping - and it may even lower your energy bills. It comes with an adhesive strip which you apply around the window frame, then cut the film to size, attach, and smooth over the creases with a hair dryer - it's easy. 12m2 Cut to size