Podguy

The 928 body is galvanized at the factory - one of the reasons you should not sand it to remove the paint. When sanding though the paint in the case of doing some body work I first treat the metal with cold galvanizing.

Your S4 should not be covered with Black Undercoating. The factory under coating is like rubber and light grey. When body shops get hold of cars they often spray tar undercoating to cover things up. The tar under coating is probably the worst thing that can be applied to a car. It traps water. Eastwood makes a uncoat removed that works on the tar stuff but does not remove the factory coat. It is a bit labor intensive to use but does work.

The light grey factory under coat is often painted over at the factory with the car color. To see the raw material you might have to look under the center of the car.

Unless your car has been cleaned up you should be able see some dirty yellow cosmoline on the aluminum cross member and front suspension parts.

GeorgeM

Plain old paint thinner works fairly well on Cosmoline and is safe for aluminum and even factory painted surfaces.

Maybach_Man

part of my effort

928porschepatrick

Maybach_Man, what type of paint did you use^^^^ ?

17prospective buyer

Also another question Maybach,

What is that rubber insulation on the oil pan for? What does it shield? I'm guessing PS related?

Maybach_Man

Hi on the underside just cellulose GP white and on the crossmember a black 'Hammerite' paint

Maybach_Man

Hi

its for the starter motor