This easy to apply and ready to use Ravensburger Puzzle Conserver adhesive is a way to preserve your completed masterpieces! Carefully slide your finished jigsaw puzzle onto a couple of layers of paper (old newspapers are good). Take the top off the glue and using the sponge applicator, put glue all the way across your puzzle. It?s important to apply a couple of layers of glue if you want to mount the puzzle into a frame. Don?t worry if the glue looks very white when you first apply it ? it will dry clear. 200ml which is enough for 2 to 4x 1000 piece puzzles.