ON THE REVERSIBILITY OF TREATMENTS WITH ACRYLIC/SILICONE RESIN MIXTURES
A.E. Charola, A. Tucci, & R.J. Koestler
IT WAS FOUND THAT the consolidating and water-repelling treatment based on mixtures of B72-DF104 is not “totally” reversible once the treatment has aged. Specifically, the in-situ polymerization of the silicone resin makes this part of the treatment irreversible. This irreversibility is limited to the exposed surface of the stone only. This feature should not be a condemning factor, as the surface will be the most weathered part, and should the treatment be totally reversible after the stone has weathered, the surface would be lost because of lack of cohesion.
This treatment, based on a mixture of acrylic and silicone resins was found to be totally reversible for the bulk of the treatment, while only a thin surface layer turns partially irreversible. This remaining surface layer, because of its chemical nature and its microstructure, should not interfere with future treatments.