4 x White Sikaflex 221 Polyurethane Glue Flexible Sealant Boat Yacht Marine
There are cheaper polyurethane products out there but Sikaflex and its excellent UV resisting abilities make it stand out as the product to rely on. 4 x SikaFlex 221, Polyurethane Flexi Glue/sealant (Black) 300ml, (Suits caulking gun).