Do all your lights flicker headlights & dash lights, When engine is running? If it still does it after you rev the engine up some. I would suspect one or the other a bad voltage regulator or a bad alternator. I would replace the regulator 1st.
Have you checked out Autozone the Vinyl trim they sell? It comes in different widths with a adhesive 3-m backing. I have used this on
streetrods I have built for windshield and back glass trim. I have painted it black before with good results if you use a good primer first. :cheers: