There will be good comments mate no doubt about that. Depending how deep the scratches are, i can only imagine the markings under false lighting will look a little on the bodge side of things as you will clearly see the levels that are raised and filled. This method would also come in cheaper than a smart repair. The only way i would ever try this method is if its good enough to wet sand them out then i guess this would be plausable as your not comprimising the clearcoat thickness. Then again, if they was fine, i wouldnt bother with the black foundation layer. Ive used the rattle can method numerous of times to fill in very light scuffs, areas and compounded afterwards with no problems or comebacks.