The faraday cage effect happens when powder coating a part that has a tight angle or corner. Electricity follows a ground path of least resistance. The areas adjacent to the corner offer an easier more accessible path, and thus the charged powder readily flows to those areas but does not flow as easily to the corners. This is a common occurrence which can be mended by reducing the KV output prior to application and/or spraying at a lesser or indirect angles to allow the powder to wrap into the corners. Shooting directly at faraday corners is an ineffective exercise. It is a good idea to make the habit of identifying possible faraday areas and spray those areas first.
The weld at the corner is an example of a possible faraday cage area
