First off Ford Black UA is not the same for all vehicles types...matter of fact the Mustang that was painted in the same factory maybe on a different day could be a different black than your car. There are so many factors such as temperature, humidity, air pressure or volume that can change the color to some extent. The factory have most of these variables fairly stable from day to day but when a run of lets say yellow mustangs are painted just before spraying a run of black cars then initial black cars will actually have some yellow in the black. Maybe not that visible to the untrained eye but there will be a difference. If I am not mistaken I believe UA black has 6 or 7 variances of the same color. These variances are discovered by the manufacturer as well as the body shops and reported to the paint manufacturers.
When matching paint the color should be sprayed out on a card and compared in sunlight to the adjacent panel such as your fender. That is the bodyshops duty to get the closest match possible. If they had the car when spraying the bumper then they should have caught that the first time around before even spraying the bumper. But we also got to remember it is almost impossible to block paint and get away with it..only if you are really lucky will you get an exact match. Therefore that is why most bodyshops will only paint if they are allowed to blend onto the adjacent panels such as your fenders. However, most body shops will not blend if it is the front or back bumper...why?...because we all know that urethane bumpers and even fiberglass bumpers take paint differently than metal so even from the factory, urethane bumpers do not match fenders or qtrs exactly. Just go to a local new car dealership and take a look around. Insurance companies know this and that is why many of them will not pay for blending adjacent panels to a urethane panel such as a bumper.
As regards to the primer or previous paint under the black...it makes no difference because if the shop applied enough base coat then no matter what color it is underneath the solid black color would cover anything underneath. You only have to worry about that with transparent colors.
So my take on your situation would be that the shop should have seen the drastic color difference before painting it the first time if they had done a spray out card. However, even if they had a perfect match with the card it may still be slightly off from the fenders and that is just the way things are and not much you can do about it unless you go to greater more costly extents in seek of a perfect match.
This is just my opinion and from my experiences over the last 15 years in the business. Paint matching can be easy but at times can be a royal pain in the you know what at times. Especially if limited to block painting. My suggestion is to get it close as possible and then let it go. Hope this helps. Charlie @
groundupautosports.com
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