From Guild Wars 2 Wiki
“Coat the target area with a glue puddle that immobilizes foes on impact, then cripples foes that remain within.
— In-game description [?]
- The glue puddle is created by a slow-moving projectile, meaning that the user might need to lead their target.
- The glue puddle will reapply cripple every second for its full duration.
- The glue puddle's centre will appear where the cursor was pointed when the skill was activated. To get the maximum effect possible for enemies charging towards the player, fire ahead of the target so it will be on the edge of the puddle when the projectile lands.