Boston-area independent tool dealer Justin McCarthy talks about why the Cal-Van Tools Oxygen Sensor Wrench, No. 843, is a tool that's been a big seller for him.
One would think that using a very aggressive sandpaper will provide a rough surface for the paint to adhere to and be a better prep than using 320 grit. One would be wrong.
Know which grade of aluminum you are using, and use a primer designed to be applied over that aluminum.
Plastics can be split into two groups: polar and non-polar. Think of polar plastics like water and non-polar plastics like oil.
It all comes down to the properties of the metal or plastic, otherwise known as substrate.