What is the disadvantage of after foaming.

The so-called front foaming is that 80% of the PU caulking agent has been foamed after spraying, and the amount of foaming in the back is small, so that the worker can grasp the strength of the hand well when using the foaming gun, which is simple and convenient. And no waste of glue, greatly saving costs. After foaming, the gradual thickening of the glue is several times thicker than when it is shot. This makes it difficult for the worker to grasp the strength of the trigger on the hand, and it is easy to waste the glue, at least 1/3 of the waste, and then the expansion. After the glue is cured, it is easy to squeeze the doors and windows.