I bought a used car. I noticed there was a small crack/hole on the roof about the size of a piece of rice. After looking online how to fix it, I sanded the area to make it smooth and applied my primer and paint. The color looks fine but I notice that when I look at the area as a whole you can definitely see where the "painted area" is compared with the rest of the car. It there any way to make this look more flush and not as blotchy?