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 simple to use. Best of all; Le-Glue releases easily with warm water returning your blocks to new condition. Say no to Kragle and yes to Le-Glue!