Im working on a 1999 Saab 9-3 convertible windshield that has some minor scratches from the wipers. I purchased some cerium oxide paste and pads from another site and after using these products for an afternoon the results are not what I expected. So I just purchased the Eastwood glass sanding pads. Question 1. Will the Eastwood pads work with the Ceriglass buffing medium? Question 2. Im using a Porter Cable DA buffer. Will this machine be sufficient or do I have to use a rotory. I have an old Craftsman 2 speed buffer, the problem is it dosent have a 3 inch pad for the discs I purchased.