To provide a device such as a thermal spray device which is tightly attached to a surface of an object and movable along the surface of the object.
In the device, at least an outer casing, an outer seal member and an inner seal member specify a first area in cooperation with a surface of an object, and at least an inner casing the inner seal member specify a second area in cooperation with the surface of the object. The pressure of a fluid present in the first area is maintained at the pressure higher than the pressure of a fluid surrounding the device. The pressure of a fluid present in the second area is maintained at the pressure lower than the pressure of the fluid present in the first area. The device has a means for allowing an inert gas to flow into the second area.
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