If you apply a topcoat to bare substrate (metal for example), the paint will peel, flake off, or look rough in a matter of weeks.

Question

Quizplus · Accepted Answer

Applying a topcoat directly to a bare substrate without proper preparation or a suitable primer can lead to poor adhesion, resulting in the paint peeling, flaking off, or having a rough appearance due to the lack of a proper bond between the surface and the paint.

If You Apply a Topcoat to Bare Substrate (Metal for Example)