Popped Bloons that were glued leave a blob of glue on the track.
~ BTD6

Relentless Glue is the fourth upgrade of Path 3 for the Glue Gunner in BTD6. It allows bloons to leave a blob of glue on the track upon being popped. Blobs left on the track will last for 5.0 seconds before disappearing. It costs $2,550 on Easy, $3,000 on Medium, $3,240 on Hard, $3,600 on Impoppable.


Relentless Glue is another method for the Glue Gunner to counteract its initial lack of proficiency against large groups of bloons, in that it can coat one bloon and transmit to a second target once it is popped. This is crucial, as it allows the Glue Gunner to benefit from the prior upgrade MOAB Glue, coating a MOAB's worth of bloons and creating a large-scale spread of glue to many targets at a time with the assistance of other towers.

In tandem with its slowing prowess to normal and MOAB-Class Bloons, Relentless Glue allows for the solidification of a good chokepoint where bloons are rapidly destroyed from tower fire, creating more glue blobs on the track to slow those that sneak through.

Choosing the secondary upgrade path can be rather tricky; Path 1 provides Glue Soak and Corrosive Glue, allowing a single shot to convert a single MOAB class into many blob's worth of glue when fully destroyed with the glue puddles also gluing Camo Bloons, as well as adding damage over time. Path 2 provides Bigger Globs and Glue Splatter, allowing the Glue Gunner to be a more congestive asset rather than a choke-point holder, trading out quantity in a single area for viral blobs that slowly travel down the path as the bloons afflicted with them. However, since the glue only soaks through 3 layers, there aren't too many uses for this in this case.

Both variants are best placed early on into the track, coating MOABs and large groups of bloons early on to slow down the threat and build up glue against the bloons during the round.



  • Relentless Glue is likely inspired by the third upgrade of the Glue Gunner's Specialty Building, the Glue Supply Depot.
  • In Bloons Tower Defense 6, this is the only way a Glue Gunner can glue Camo Bloons without support and abilities.
  • Relentless Glue, Double Gun (and by extension, Bloon Trap and XXXL Trap), and Robo Monkey are the only towers to be holding a pair of guns.
    • Strangely enough, Relentless Glue neither attacks faster nor attacks two separate projectiles per shot. It also doesn't have bonus popping power either.

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