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Glue Soak is the second upgrade for the Glue Gunner in Bloons TD 4, the first upgrade on the 1st path on Bloons TD 5, and the first upgrade on Path 1 in BTD6. When a Bloon is glued by Glue Gunner with this upgrade, the glue soaks through the bloon layers gluing all of its descendants. Prior to BTD6, glue will not affect M.O.A.B. Class Bloons as Glue Gunners don't attack them. Without this upgrade, popping a glued bloon will make the glue disappear. Gluing a Ceramic Bloon would be pointless without this upgrade, because Ceramic Bloons cannot be slowed down by glue, except in the Mobile/Steam versions.
In BTD6, this upgrade will soak through all layers of bloon but will still never soak through layers of MOAB-class bloons. Glue Gunners are not capable of gluing MOAB-class without Corrosive Glue or MOAB Glue though.
Update History (Bloons TD Battles Mobile)Edit
Glue Soak price decreased ($200 → $150).