This glue is extremely good for foam builds and repair. 

UHU POR holding box 40 g / 50 ml: UHU POR is a quick-setting special adhesive for bonding expanded polystyrene, e.g. Styropor® also in combination with other materials. It forms an elastic adhesive film which is highly resistant to age and which is colourless and waterproof. Elastic adhesive film is colourless, non-ageing Quick-setting Suitable for expanded polystyrene, e.g. Styropor® also in combination with other materials Odourless and transparent when dry Waterproof UHU - glues anything, anytime. UHU accompanies most of you since kindergarten and school. Over 600 million consumers in over 125 countries trust in the proven brand quality of UHU. People of all age ranges, in the most varied of life situations and professions, users in the most contrasting of sectors, whether private or commercial, know UHU and consider UHU to be the solution to all of their domestic, hobby-related, school and professional adhesive needs.