This easy to apply & 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 & using the sponge applicator, put glue all the way across your puzzle. ItÂ’s important to apply a couple of layers of glue if you want to mount the puzzle into a frame. DonÂ’t worry if the glue looks very white when you first apply it Â- it will dry clear. 200ml which is enough for 2 to 4x 1000 piece puzzles.