This stuff will bring out any depth of scratch if you use enough effort. I have used it many many times on discs belonging to others but it is hard work. If it's a small gouge in the disc then I use a cotton bud cit right down in a low voltage drill. Finish off with a duster and some spray polish... it won't harm the disc in the slightest and the disc will look pristine, no swirl marks or dullness.
If it does play in a PS3 and not on your PC then it's marginal. If you haven't already doen so try giving it a good polish with a duster and spray on furniture polish (Mr Sheen type... that's suitable for all surfaces).