For most doses that we had used the spray master held the can firmly optimally and there were no problems.
However, it may happen that depending on the can, the can aside and tilted so the spray is no longer just strikes the surface to be sprayed but wegsprüht to one side. In this case, we then sprayed without Spray Master.
The deduction can be metered well the spraying also. However, this is certainly not for professional, detailiiertere work.