Foam gun and charges to it
Many have experienced what a polyurethane sealant is and how cunning it is when it is handled incorrectly. Two stages of expansion with subsequent tightening can disrupt even the most seemingly high-quality filling, if at least a little mistaken with the dosing of individual portions. By the way, the filling of joints in batches is recommended for the simple reason that hardening of the mass takes place from the outside inside. If the layer is too thick, then at a depth of 3 cm under the crust there is a deficit of moisture that does not come from outside, voids and shells are formed.
Dosing with household cylinders with nozzles in the form of tubes is difficult, due to the very high density of the sealant at the output of the .A disposable spray gun for professional foam mounting can reduce the possibility of blemishes due to the relatively low density of the sealant at the outlet, so that the secondary expansion is reduced, and the shrinkage is very low. An important role is played by the convenience of performing operations to fill the seams and cracks.
We are ready to use the gun for mounting foam
To use a conventional household polyurethane sealant container, shake it a few dozen times, then install the nozzle and press the valve, turning upside down so that the gas does not get burned faster than the foam. However, there is a certain inconvenience - this balloon should be emptied entirely and immediately. Otherwise, after a short time, the mass in the tube and valve will solidify, and everything that is left inside will be thrown together with the container.
The diameter of the nozzle for a household balloon is approximately 5-6 millimeters, which causes the gas to come out with a small head and poorly foams the mass, leaving it too dense.
The gun for mounting foam uses several different cylinders that can not be used with a household nozzle. A special thread in place of the valve allows you to screw the container with foam into a special socket located at the top of the gun. With the charge installed, the tool becomes like a paintball gun. After pressing the trigger, the pistol, as it should, produces a shot, releasing a foaming clump of sealant from the barrel bore. It is noteworthy that one professional balloon can be used repeatedly.
How to make the right choice of foam gun?
Like any other tool, the spray gun for building foam is represented by a large number of models. The most inexpensive are plastic ones. However, the choice of a gun for mounting foam should be based on practicality, which means that preference should be given to the most reliable tools. The principle of operation of each of them is the same - there are two valves, with the top is connected to the primary filling tube, from it extends the extension, inside which is located the rod, which opens the second valve after the trigger is pressed.
We screw the balloon onto a special ring, turned to the limit, we screw it until the hiss is heard, and here the gun is loaded, the foam has filled the chamber inside, and from the work front it separates the second valve. So, if you repeatedly use the tool, sooner or later all channels will be tightly sealed with sealant, despite regular cleaning. Therefore, it is better to choose a gun that is fully versed. This will make it possible to thoroughly clean every detail and bring the tool to readiness before the next filling of seams and cracks.
However, such a tool will cost more, non-separable and plastic will cost you 20 or even 10 dollars. Try to check the valves before purchasing the tool, this can be done with a special cleaning fluid( acetone), which is also filled into cylinders under pressure .Screw this balloon and do some test "shots".If after filling channels from the front valve does not emit liquid, then everything is in order.