The effectiveness of impregnation of a porous stone with a resin in solution is determined by the processes of migration of the macro-molecules into the pore network and their interaction with the mineral surfaces. These factors have been investigated in the case of a medium molecular weight poly(vinyl acetate). The limiting factor is precipitation of the polymer as the solution enters the stone. See also AATA 20-877 for related study and 21-914 for entire proceedings. -- AATA