Let us know how it works. Didn't work well for me and tossed the tank. Took along time and results were poor.
Have you filled the tank and viewed the scratches with water in the tank? You'd be surprised how much will go away...
Or turn it around (put the scratchier side on the back)...
Matt
i have a 10 gallon tank that leaks. you can have it if you want for free, and proceed to scratch it up and see if you can buff them out.