Viscoelastic compositions capable of preventing microbial proliferation and capable of capturing microbial membrane and cell wall decomposition products are provided. The compositions comprise thermal reaction products of blends of fatty acids derived and isolated from drying and semi-drying oils such as linseed, safflower, and tung oil, with a polymer component such as for example poly (isobutyl methacrylate). These compositions are capable of capturing microbes and controlling their proliferation at a material on which the compositions are deposited, and further capable of absorption or incorporation of lipopolysaccharide and protein membrane materials and endotoxins.