The C2 Fibreglass Left Hand Wall Fillet to Upstand Corner is a moulded hot pressed pre-formed corner suitable for use where a kerb edge meets a wall/fillet. Installation When installing the C2 Wall Fillet, 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.