This is the Woodland Scenics S190 Scenic Glue - Matte.

A specially formulated, non-odorous adhesive for applying landscape materials. Scenic Glue is a thick, flexible, strong-hold adhesive that dries clear with a matte finish. Water-soluble and non-toxic. Apply Scenic Glue and press scenery material into adhesive.

8 fl oz (236 mL).