PVA (Polyvinyl Acetate, commonly known as Vinac™ *) is a high-quality preservative coating and consolidator that can be used on a huge variety of fossils. We use high-purity, Polyvinyl Acetate Beads (PVA), as a penetrant and coating for fossils in both the field and in the laboratory. These nontoxic beads are dissolved in pure acetone (approximately 1 part PVA beads to 8 parts Acetone) to make a concentrate. This is later thinned with additional acetone for different viscosities for various uses. A thick solution will work best to slow the weathering if a specimen must be secured for later excavation and extraction, or for keeping fragile bones and teeth together. A thinner solution will leave a light protective coating on the surface of prepared fossils and is commonly used on fish from the Green River Formation.