I can't read the words on the plaque. Can I spray paint by hand?

Of course. Plaque spray will fade with the passage of time, and the hand-painted color will be brighter, which can solve this problem and will not cause other effects. So the words on the plaque can't be seen clearly, so you can draw them by hand. A plaque refers to an engraved wooden board, usually made of metal or wood, placed on the lintel or wall to mark the place or commemorate someone or an event.