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Popped Bloons that were glued leave a blob of glue on the track.
~ In-game description

Relentless Glue is the fourth upgrade of Path 3 for the Glue Gunner in Bloons TD 6. 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, and can glue up to 1 bloon regardless of crosspaths. These track blobs can affect camo, even though the original projectiles do not. These blobs can additionally apply MOAB Glue effects onto MOAB-class bloons, although due to the pierce of each glue blob it is hardly noticeable. The blimp slowdown remains at 37.5% slowdown from the MOAB Glue upgrade, but its glue priority is, in general, one level higher than MOAB Glue, according to the glue prioritization system.

This upgrade costs $2,550 on Easy, $3,000 on Medium, $3,240 on Hard, and $3,600 on Impoppable.



Relentless Glue changes the Glue Gunner's protective suit to grey and gains another glue gun.


Targeting Priorities[]

Relentless Glue targets bloons using the standard targeting priorities. It shoots straight movement projectiles.

  • First: Targets the first bloon visible within its range.
  • Last: Targets the last bloon visible within its range.
  • Close: Targets the closest bloon visible within its range.
  • Strong: Targets the strongest bloon visible within its range.

The glue blobs produced by popped bloons are on-track, at least in general scenarios (outside of additional status effects such as blowback), and can detect camo.


Updated as of Version 31.0. Listed prices exclude buffs, sacrifices, and Monkey Knowledge.
Purchase Sell
Costs Easy Medium Hard Impoppable Easy Medium Hard Impoppable
Upgrade (X-X-4) $2,550 $3,000 $3,240 $3,600 -
Total (0-0-4) $6,115 $7,195 $7,765 $8,635 $4,281 $5,037 $5,436 $6,045
Crosspath (1-0-4) $6,285 $7,395 $7,980 $8,875 $4,400 $5,177 $5,586 $6,213
Crosspath (2-0-4) $6,540 $7,695 $8,305 $9,235 $4,578 $5,387 $5,814 $6,465
Crosspath (0-1-4) $6,200 $7,295 $7,875 $8,755 $4,340 $5,107 $5,513 $6,129
Crosspath (0-2-4) $7,730 $9,095 $9,820 $10,915 $5,411 $6,367 $6,874 $7,641

This upgrade's prices (or included crosspath's prices) are affected by the following MK: BonusGlueGunnerIcon.png Bonus Glue Gunner, ComeOnEverybodyIcon.png Come On Everybody!, BetterSellDealsIcon.png Better Sell Deals



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.

In tandem with its slowing prowess to normal and MOAB-Class Bloons, Relentless Glue can reinforce a good chokepoint where bloons are rapidly destroyed from tower fire, creating more glue blobs on the track to slow those that sneak through. In essence, an effectively used Relentless glue combines the powers of all three paths, lasting longer and slowing more, soaking through layers, and hitting multiple bloons.


  • The best crosspath for Relentless Glue depends mostly on what niche must be fulfilled the most. Path 1 is more useful when it comes to improving the crowd control potential of regular bloons, while Path 2 is for optimizing the effectiveness against MOAB-class bloons by maximizing the pierce of the MOAB Glue's blimp slowdown potential.
    • Relentless Glue virtually requires Glue Soak to function as crowd control, as the bloon must be glued as it is popped to leave a glob behind, and because of the slower and more widespread gluing, Corrosive Glue can actually deal some decent damage.
      • A 0-2-4 glue is virtually a waste of this upgrade's unique crowd control potential, as the puddles will almost never be produced, and can only function in extremely niche circumstances, such as combining with high layer towers (which can be considered to be quite rare or expensive) such as Snipers to instantly pop glued bloons.
  • Like all Glues, it works best at the start of the track, however, it is actually beneficial to leave its targeting to First, as it can then glue most bloons behind the first bloon. This is particularly effective in rounds that open with weaker, faster bloons such as pinks or purples.
  • Always combo with Primary Training when possible, as the tower is a lot more effective with even a single extra pierce. It also works surprisingly well in tandem with Alchemist buffs.
  • The tower tends to face competition from Glue Hose and MOAB Glue as both have access to much higher pierce with Glue Splatter. This tower may be useful to allow for camo support or for greater coverage in terms of range, but it is also slower to glue incoming bloons as it relies on the first few bloons to be popped.

Version History[]

  • Change Description changed from "Popped Bloons that were glued, leave a blob of glue on the track." to "Popped Bloons that were glued leave a blob of glue on the track."
[...] Very small nerf to the slow amount on MOAB Glue as it has for a long time held a dominating spot in MOAB support, but this same amount has been returned to the previous value at Tier 4. We are still looking at future improvements here, including reworking the priority tree of glue stacks.
~ Ninja Kiwi
  • Change Indirect buff, since MOAB Glue was nerfed from 0.625x blimp slowdown to 0.75x slowdown.
[...] Due to quirks with game state interactions temporarily preventing more nuanced changes, we have decided to leave MOAB Glue's slow amount on MOABs as it was previously, coming back to Relentless later. However xx4 Relentless Glue will still layer over the top of it.
~ Ninja Kiwi
  • Change Reverted indirect buff, as MOAB Glue came back to 0.625x slowdown. Relentless Glue will still be able to layer over MOAB Glue, however.


Official artwork[]



  • Relentless Glue is likely inspired by the third upgrade of the Glue Gunner's Specialty Building, the Glue Supply Depot.
  • In Bloons TD 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.
    • Relentless Glue neither attacks faster nor attacks two separate projectiles per shot. It also does not have bonus popping power either.
  • The description for Relentless Glue was notorious for its poor grammar mistake, as noted by a number of players. Before Version 22.0, the description was "Popped Bloons that were glued, leave a blob of glue on the track." with the erroneous comma.
  • The initial design for Relentless Glue was that it would leave blobs of glue for every layer of Bloon popped instead. It was deemed too overpowered and lowered the game's performance, and was redesigned and balanced to the current form.[1]
  • To test Relentless Glue glue track blobs affecting blimps, get a Relentless Glue to stick glue on one bloon, then send a MOAB and let it reach the glue track blob. The MOAB should be slowed down as a result of touching it.