Peeling paint must be scraped away so that new paint will adhere.
Will any paint adhere, or must the whole patio be covered with a new layer of concrete?
In general, oil-based paint will adhere better than latex.
Sand areas of shiny but sound old paint to produce a rough surface that new paint will adhere to more easily.
First, check the label on the container to be sure the paint will adhere to the surface you intend to decorate.
A result was that the paint never properly adhered to the wood, necessitating the recent attempt at removal with heat guns, which caused the fire.
The vinyl is shiny, and I am afraid that regular paint will not adhere properly.
Loose or flaking paint also must be removed so new paint will adhere.
Washing the surfaces to be painted helps new paint adhere.
A drawback of silicone caulk is that paint will not adhere to it.