I used the applicators that came with the kit and also had horrible streaking on my black paint. I couldn’t see the streaks all the time but when my wife asked me about them I knew they were too much. I polished them off and this time when I re-applied the coating as I had quite a bit left I used a different, better, applicator. No streaks and nice even coverage. My streaks and uneven coverage were able to be seen as actual streaks on the paint not just with the UV light.