I used this glue (diluted with warm water) instead of mystery glue. It leaves a clear matte finish that fills gaps easily and holds frame puzzles together well. I end up applying three coats because I diluted the glue with water. However, diluted adhesive is required for even distribution (ratio of water to adhesive 1:1). Allow to dry between coats. Apply with a pastry brush. Because it's from Elmer, it cleans up easily with warm, soapy water. These two bottles make about five 24" x 36" puzzles.
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