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Polymeric products are largely used for consolidation of stone in the field of cultural heritage. Nevertheless, the main problem of polymeric compounds is related to their macromolecular nature, it being difficult for a polymer to penetrate inside the pores which may have a very small diameter. These considerations are the starting points for in situpolymerization. According to this technique, not the pre‐formed polymer, but the monomer is introduced into the stone and it is polymerized in situin a subsequent step.