The C1 is a hot press moulded GRP pre-formed external corner. It is for use with A200 and B260 profiles to form a left or right hand corner. Fitting Instructions The corner should be nailed to the deck at each end and in the middle. The joins between the trim and the corner should be sealed with a thin line of PU trim adhesive, a moist finger can be used to wipe the adhesive, ensuring it seals the entire joint. The joint is then bandaged over. Tissue should be used to ensure a smooth finish.