Heres how we do it at work...You already sanded the primer down with 500 or 800 grit I assume.....use wax and grease remover on the bumper right when you get it in the booth. Spray you sealer on it. After the sealer has flashed you spray your 1st coat of base...after the base has dried check for any dirt or scratches or any blemish in the bumper..sand the dirt out...shoot next coat of base on it..clear coat and then do a 2nd coat of clear and you should be ok. You really dont need flex agent with good paint. I heard that flex agent wears off after time as well. Thats what Ive been told while I was at tech school,through paint reps and even some painters ive worked with. Now if the bumper is "raw plastic" then you need adheshion promoter before you put sealer on it but ford bumpers always are primed and usualy have scratches that need to be d/a out any how...Thanks Ford lol
You shouldnt need adheshion promotor since its just a few spots. Depending how big those spots are Id hit them with like 2 coats of primer and wetsand those primer spots again with 500grit wet. We use adheshion on new raw bumpers usually toyotas,kia/hyundai,mitsubishi and a few others coem this way. Its basically just deal ya put in and spray lightly over the raw plastic...since your bumpers been painted and is small spots dont worry youll be ok.
As for sealer its best to use the same brand sealer as your base if you cant or just stick with a good name brand..PPG..DuPont..Glasurit..Akzo Noble/Sikkens or if yoru ona budget Omni should work well.
I know this is sort of unrelated but a lot peoples bumper paint flakes off and they assume its lack of flex add it usually is in the prep where the bumper wasnt sanded well.
Our paint company gave me info on how to paint a new urethane bumper and the first thing he told us to do was wash the bumper with very hot water and Spic and Span soap. He said this will ensure all the mold release agents are removed before we start any sanding or spraying. Of course you are not dealing with a new bumper, but thought I would mention it.
Our paint company gave me info on how to paint a new urethane bumper and the first thing he told us to do was wash the bumper with very hot water and Spic and Span soap. He said this will ensure all the mold release agents are removed before we start any sanding or spraying. Of course you are not dealing with a new bumper, but thought I would mention it.
This is very trueRelease agents on molds are very tricky even after the part has been painted. Sanding a urethane part can sometime reactiveate the release agents. They are water based so sometimes wax and grease removers don't work. Always wash the part to be painted in hot water and spic-n-span or Dawn dishwashing soap to remove any release agents before and after sanding.
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