You do not have to spend hundreds or even thousands of pounds to repair a leaking flat roof. Even with minimum D.I.Y skills you can easily waterproof the roof on your extension, garage or shed using Mariseal Detail. Please be aware that there are dangers working at height and while this is one of the best products in the world for roof repairs - sometimes you might just need a whole new roof.
Mariseal Detail is a liquid-applied, thixotropic, permanent elastic, fiber-reinforced, cold applied and cold curing, one component polyurethane membrane used for long-lasting waterproofing. Mariseal Detail can be used on wall-floor connections, pipes gutters etc.