Composition comprises: at least one organic polymer at least one monomer for polymerization at least one monomer for radical polymerization at least one particulate inorganic additive and at least one fatty acid ester or a mixture of fatty acid esters. The additive has a Brunauer-Emmett-Teller (BET) surface of at least 40 m 2>/g, and comprises covalently bound hydroxyl groups. An independent claim is included for a Kit comprising a paste A and a paste B, where: the paste A comprises (a1) at least one monomer for radical polymerization, (a2) at least one organic polymer that is soluble in (a1), and (a3) at least one polymerization initiator the paste B comprises (b1) at least one monomer for radical polymerization, (b2) at least one organic polymer that is soluble in (b1), and (b3) at least one polymerization accelerator and one of the pastes A and B comprises at least one particulate inorganic additive as component (a4) and/or (b4), and at least one fatty acid ester or a mixture of fatty acid esters as component (a5) and/or (b5).
