In restoration, precisely indicates a substance capable of re-establishing a sufficient cohesion between materials that have undergone a compromise within the microstructure. To explain this function, a substance in a fluid state (essentially liquid) is used for the impregnation of the structure (through the pores, the small cracks and cleavage), so that in the adhesion process, through the reaction or evaporation of the solvent, "a cohesive weave more homogeneous and commiserated to the specific material context" (M. Matteini, A. Moles 1989) is reconstructed. Although consolidating properties belong to a vast group of adhesives (for example the animal glues, see adhesive), one identifies the adhesive action with respect to an operation of adhesion that must be reversible, while that of consolidation is generally irreversible. Among the consolidants normally used, the animal glues, the hydroxides of alkaline earth metals, Calcium and Barium, various artificial polymers and essentially, acrylic and metallic polymers (Paraloid, Crilat and Primal).