Glue contains an extreme solvent that melts bloons. While glued, bloons will pop twice every second.
~ Official Description
Bloon Dissolver is the 3rd upgrade on path 1 for the Glue Gunner. It costs $2805 (Easy), $3300 (Medium), $3565 (Hard) and $3960 on Impoppable. It makes the corrosive glue more powerful, popping bloons 4 times as fast, 2 layers every second, Researching Bloon Dissolver will cost 7,500 and 20 on Bloons Monkey City.
The reason why the Corrosive Glue Gunner to Bloon Liquefier wearing a protective suit is because the glue has chemicals which can dissolve and they don't want to get caught in the glue.
Due to the fact the time of the bloons being glued lasts slightly shorter in an update, thus, it is possible a non MOAB class higher ranked bloon can survive being glued by the 3/0 glue gunner without being hit by other towers.
A 3/0 Bloon Dissolver can destroy Ceramic Bloons with their children before the glue disappear, making the x/1 upgrade useless, unless you want to upgrade it to x/2 upgrade, the same goes with Bloon Liquefier.