If you haven't asked already, it is worth asking the paint shop to replace the stone guards. If they balk, tell them you will provide the vinyl guards if they will put them on. It should only take a few minutes.
The blue masking tape is great for interior walls because it is low tack. This helps prevent pulling off paint and paper from the wall. Since there might be abrasion involved in cleaning or removing the stone guards, a higher tack masking tape might be a better choice. If the paint pulls off the body panel, the paint shop needs to repaint the car.