I want to fix some small scratches on my car can you give me some guidance on how I should proceed?
These are my scratches.
Looking at your pictures, I don't think you need any filler. Just sand down and feather the areas, use a high build urethane primer to fill in any low spots, and paint. If you need a little filler (I highly doubt you will) icing works well for shallow scratches.
Another thought I just had, if the scratches were really deep, you could fill them in/build the area up with a plastic welder, then sand it back down to smooth.