What is the recommended approach to minimize rebound during gunning?

Minimizing rebound during gunning is essential for achieving a successful application of refractory materials. Working in an upward direction is the recommended approach because it allows the material to adhere better to the surface as it is applied. When gunning upward, the material is less likely to fall away from the surface due to gravity, which significantly reduces the chance of rebound.

In contrast, other methods can lead to increased rebound. For instance, gunning at high speeds can cause the material to overshoot the target surface and result in more material bouncing back. Using thick layers of material can also contribute to improper adhesion, as the weight of the thicker layer may cause it to fall instead of adhering. Lastly, avoiding pauses during the gunning process may hinder the operator’s ability to control the material application effectively, which can also lead to increased rebound. Therefore, applying material in an upward direction is a strategic method to improve the application process while minimizing waste and ensuring a better finish.