Everbuild Glues are good. Their bottle ready to use interior & exterior glue is great and probably more what you are after. But for something even stronger, going as far as marine applications their Resintite glue (Cascamite) is brilliant, its a powder than requires mixing with water. The clean-up of cascamite is easy, a tub of hot water and a brush, cleans all excess off nicely! I usually wipe the whole item in the hot water to avoid any water stains appearing.