A kit for forming a biocompatible material provides a protein solution and a polymer solution including a derivative of a hydrophilic polymer with a functionality of at least three. Upon mixing. the protein solution and the polymer solution cross-link to form a non-liquid, three-dimensional network that degrades over time back to a liquid form. The polymer includes a degradation control region selected to achieve a desired degradation period and a cross-linking group selected to achieve a desired cross-linking period. The kit provides instructions for forming a mixture of the protein solution and polymer solution and for applying the mixture. The mixture serves as the foundation for multiple material composition species, each adapted to a specific therapeutic indication.