Le-Glue is a Non-Permanent glue that's Strong, Non-Toxic and won't damage your blocks. It is a water RELEASABLE adhesive designed to hold your plastic building blocks together. Le-Glue works with all types of blocks including LEGO and Mega-Bloks. Simply dip a block and stick it in place, it's that easy to use. The magic is; Le-Glue releases easily with warm water returning your blocks to new condition leaving no residue when cleaned. Say no to Kragle and yes to Le-Glue!