What makes Polyplabs glue different? Initial use child proof protection ring Positive pressure only aluminium tubes means you get all the glue that you pay for Ability to glue underwater with out any back syphoning / compomising the product Its an ultra thick gel that you can litterally "make ice cream cones with" Every tube comes with its own stem Stem diameter is uniform for a perfect application Glue has an 8 hr work time when exposed to air for extended frag session Glue will react with water and bond within 5-15 seconds Great for fresh water plants as well.