I just received my Fiberglass Restoration System kit, and started playing with the No 49 Oxidation Remover on several out of the way places. (The roof is fiberglass, so I can try all kind of things and you can't really see them unless you're on the roof).
I've tried by hand and with my PC; one coat, two coats, three coats; more product / less product; letting it get almost dry / removing excess when it's still wet...etc. In all cases it looks a lot better, but not quite what I was hoping for - it still looks yellow.
On the roof there's an area where the antenna blocks the sun when it's down. This area is still very white. The surrounding areas are yellow from the effects of the sun. I did my tests in areas adjacent to the white area - at best I've got about half of the yellow out.
Do I need to go to a more aggressive product? Or do I just need some improved technique?