Abstract
Comparative evaluation was performed on three commercially available ethyl silicates as possible consolidants for earthen finishes: uncatalyzed Silbond 40 in a 1:1 solution with ethanol, Conservare OH100, and Funcosil SAE 300E. Of particular interest was the compatibility of ethyl-silicate–based consolidation with water-based reattachment treatments. The testing program utilized facsimile coupons representing earthen finishes found at Mesa Verde National Park in Colorado and measured exposure to changing relative humidity, response to liquid water, surface cohesion, and effect on appearance. Samples were subjected to measurement with a linear variable differential transformer, environmental scanning electron microscopy, timelapse photomicrography, observation during wet-dry cycling, water drop absorption testing, colorimetry, and photographic recording. A comparison of the three ethyl-silicate–based consolidants clearly demonstrated that they can perform very differently on the same earthen substrate, and that careful selection should be made prior to use. Many questions remain regarding the influence of the finish composition, finish condition, and environmental conditions on the effectiveness of consolidation; further test development and testing are recommended.
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