Correct application process. But like you said it forms a skin, doesnt really bond to the metal.
Its thicker, like i mentioned so it can be allied over 80 grit/scratch surfaces and with enough powder will level out the surface and not show the imprefections. Paint needs 600 grit for color coat to give a glass like flat finish. Primer should be around 320-440 prior to laying it down, for physically adhesion
A good painter is consistant with the application. Look at a heavy metalic content or pearl base coat… if you suck at spraying it will look like bawls. powdercoat, aslong as it covers the surface 100% physics and chemestry do the rest.
Exactly. Not only water but chemicals, salt… but just like paint anything that gets under the surface and touches the metal… it is fucked. but yeah when PC chips, it will catch other rocks, stones, branches, what ever else comes in contact with it physically and can and will keep chipping.
Metal etch primer is the strongest chemical to metal bond I can think of like you said.