Disclosed is a composition comprising a chemical formulation useful for creating geosynthetic composites in-situ, which includes a reactive ester having at least one carbon-carbon double bond, preferably a vinyl ester of a C9 to C11 versatic acid or vinyl ester of a long chain fatty acid, or a combination thereof, at least one unsaturated thermoplastic elastomer soluble in the reactive ester; at least one di- or tri-functional acrylate or methacrylate monomer. The formulation may further include a non-aqueous drilling fluid.