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Plaster is porous and soft. Therefore, artists sealed their works to reduce the porosity. High levels of humidity are dangerous for a variety of reasons, especially antiques.
Plaster is slightly soluble in water, so it is sensitive to the changes in the relative humidity of the environment. In addition, if the structure has an armature, it is more susceptible to fluctuating relative humidity than is a surface coated in plaster.
Whether you’re looking for a waterproof plaster for your home or a new paint job, water-resistant plaster has several benefits. First of all, it’s not just for indoors. Unlike linseed oil, which may discolor and lead to mildew growth, waterglass is safe for outdoor use. Moreover, this type of plaster won’t crack, discolor, or mold.
A polyurethane varnish