Pouring Medium and Finishing Resin. Pouring medium may be tinted with color or used as a clear, very glossy layer or finishing coat. Liquid Glass is an acrylic medium formulated to mix with colors for paint pours or to be used as a resin finish. It is essential for acrylic paint colors to flow and have even suspension when using pouring techniques. Liquid Glass can be applied to any 100% acrylic painting. It is best suited for paintings that have been produced with other Tri-Art acrylic paint products as it can sometimes react negatively with products that are not manufactured by Tri-Art. Ensure your painting is on good quality canvas or wood panel.