What can occur if parts are not removed before painting?

If parts are not removed before painting, one of the significant risks is that it can lead to paint peeling at the masking edge. When surfaces are masked instead of being removed, the edges where the paint meets the unpainted surface are often not as well adhered as they should be. This can result in a weak bond that, over time and with the stresses of exposure to the elements, can cause the paint to start peeling away from that edge. Moreover, any dirt or debris caught under the masked area can also contribute to poor adhesion of the paint.

A good practice in painting and refinishing is to remove parts when possible, as this not only helps achieve better adhesion but also ensures that the paint application is uniform and thorough.