Sandblasting with water, also known as “wet sandblasting”, is a combination of abrasive blasting and power-washing. Wet sandblasting is suitable for blasting delicate materials. Water protects the surface of the material from becoming damaged in the sandblasting process. Water creates a cushion when the abrasive sand particles hit the material.
To sandblast with water, a pressure washer or a wet sandblasting gun should be used. Whether you use a pressure washer or a wet sandblasting gun, it needs an ampoule through which a water hose or nozzle can be connected. The sand and water have to mix together producing a finish that is gentler than sandblasting alone.
Just like for all sandblasting applications, you need to select a suitable grade of sand for the job. Differently than dry sandblasting, when wet sandblasting a finer grade of sand should be used. If you select a coarse grade of sand for wet sandblasting, it may damage the material.
When sandblasting with water, delicate surfaces can be blasted without the risk of damage caused by excessive abrasiveness. Before deciding whether to wet or dry sandblast, you need to consider the desired result you want to achieve as well as the type of material you are blasting.
Once you start wet sandblasting, a steady supply of water needs to come out of the nozzle. The water will protect the surface of the material from being damaged by heat buildup and excessive sand.
The speed in which the material sprays is also critical. If you spray out the mixture of sandblasting media and water too quickly, it can potentially clog the hose or nozzle.
In conclusion, wet sandblasting is great for cleaning and finishing delicate materials without causing damage. There are several considerations. You need a pressure washer or wet sandblasting gun, the speed in which the material sprays and the grit of sand you choose are all very important to getting the desired results you want.