the g3 scratch remover will probably be putting marks into to paint due to its abrasiveness,me personally i dont like these kind of products just think they make the paint worse,yes maybe they do sort of remove or mask a scratch but under light the area will stand out like a sore thumb..
i would personally save your hard earned pennies for a megs g220 or das pro and trust me you will never look back.
also use two buckets aswell..