Method for judging bumps of workpiece in spraying process

Method 1: Is there oil in the compressed air (can be checked on site)
Method 2: whether the sprayed raw materials are clean (can be tested on site)
Method 3: Is there any problem with the spray gun (can be operated on site)
Method 4: Is there any problem with the cleaning agent of the spray gun (can be operated on site)
Method five: Is there any problem with the operation of the on-site painter (can be informed to the user)
Method 6.Whether the bumps appear on the workpiece at a fixed time (can be consulted to the user)
Method 7: Is there any problem in the field environment (field test is possible)