the invention describes the production and utilization of a multi - layer composite material , a polyester resin and / or vinyl - ester resin based adhesive with special composition , applied on the surface or between the layer of the enforced object , which is made of unsaturated polyester resin and / or vinyl - ester resin based , glass - fiber reinforced , pre - made band shaped prepreg material , which can be used on surface of cylindrically symmetric objects like piers , pipes , pillars , etc . to strengthen their stability , endurance and resistance . this material can also be used to repair certain small irregularities on the enforced objects surface . initiators and substances are added to the prepreg &# 39 ; s matrix material , such as poly - ε - caprolacton ; acetyl - acetone and alkyl -- methacrylate type monomers to result in networking of the resins . peroxides decompose due to activator compounds coming from diffusion on the surface of the adhesive substance . this process ensures the complete hardening of the composite band on the whole surface and homogeneity of the assumption of load .