Have been reading alot about this lately, especially on the rat rod forums. This is a subject thats close to my heart being that my wagon mostly consists of surface rust, about 20% original paint and some godawful green housepaint!!
Here's a couple of links to threads on the subject:
Seems the problem is that unless you put a converter or P.O.R product on it it just keeps at your car like cancer.
I am debating a wirebrush attack to get all the housepaint off and then a converter and see how it looks. I'm a fan of the rat look.
Failing that she'll be going for a full respray inside and out.
Devilrod wrote:Be warned if you use a silicone based product and plan to paint the car later. You may have alot of problems. Ask any panel shop, they hate the stuff.
My old man (who sprayed cars for almost 30 years) says the same thing. He used to go off his nut whenever I used silicone based polishes on the car.
He probably had nightmares from the times he had to get rid of the stuff when preparing to paint
The thing with any silicone based products is that it absorbs into the paint, and if used on a poor or chipped paint job it will find its way into chips or abrasions and actually lift the paint
Duco and Acrylic paint finishes are absorbant to a large amount of substances.
Silicon based polishes are only one
And it just dosent stop when it gets through the paint, metal can become impregnated as well. And when this happens you have major problems
If the car is kept stored in as dry a place as possible, and not subjected to rain of major exposure to sunlight, the surface finish should stay as stable as possible considering the age of the car