4 x Black Sikaflex 221 Polyurethane Glue Flexible Sealant Boat/Marine Campervan
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).