These frames were engineered to be as corrosion resistant as can be made, and strong enough to survive far beyond that of any wall window frame made today. Our frames have a 25-mils gel coat as the outer surface, which is molded in. This provides maximum corrosion resistance possible.
FRP stands for 'Fibre Reinforced Polymer' a material made from a polymer resin, which is reinforced by chopped strand mat glass fibres to form a FRP laminate.