If you are going to paint an engine you need to clean it first otherwise the paint will not stick. This involves removing grease dirt and rust with a foam spry, or other chemical solution. The foam spray substance is compressed into an aerosol can and you can buy this at any automotive store. It is applied to the engine pieces, left a few minutes, and then washed off with water. Sandblasting helps to remove old paint an smooth out the pieces. At the time I didn’t know about sandblasting, so I neglected this step.
Your basic engine foam spray.