Corrosive Glue

Corrosive Glue tower

  • Corrosive Glue button in Bloons TD 4.
  • Corrosive Glue (upon being unlocked) in BTD5.
  • Glue Gunner with Corrosive Glue upgrade in Bloons Tower Defense 4
  • Corrosive Glue icon in BTD5
  • Corrosive Glue in BMC

Corrosive Glue is the Glue Gunner's tier 3 upgrade in Bloons Tower Defense 4 and the second upgrade on the first path in Bloons Tower Defense 5. It costs $255 on Easy, $300 on Medium, $325 on Hard, and $360 on Impoppable. It allows the Glue Gunner to shoot corrosive glue that pops one layer of a bloon every two seconds. Corrosive Glue can pop Lead Bloons and Ceramic Bloons, although it still does not slow down Ceramic Bloons except on mobile.


  • In Bloons Tower Defense 4, if a player upgrade a Glue Gunner to Corrosive Glue during a round, all of the bloons that the Glue Gunner already glued in that round will corrode.
  • The artwork of the Glue Gunner with Corrosive Glue in Bloons Tower Defense 5 has green glue dripping from his gun even though he shoots yellow glue, however the Bloon Liquefier shows yellow glue even though it shoots green glue.
  • This is the only upgrade for the Glue Gunner in Bloons TD 5 that has yellow corrosive glue.
  • Corrosive Glue pops slightly faster than the speed of which Regrowth Bloons regenerate at. This makes it effective for Regen Farming.
  • This can destroy a Rainbow Bloon on any beginner track with Stickier Glue, and a Ceramic Bloon on any beginner track in Bloons TD 4 iOS.
    • The reason is that in Bloons TD 4 iOS when popping a Ceramic Bloon with corrosion, all 10 layers of the shell count as 1 layer. It is unknown if it is a glitch or not.

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