That could just be oem paint, honda did some thin paint on our car to keep weight down, this same thing is ahppening on my hood...
As for what you should do, 150 is dirt cheap, id just pay it, just the nature of your question asking how to do it indicates you have no idea what you're doing. To make paint work look good, you need to have some experience prepping and painting...also since you probably have no experience, you probably have no supplies, which at the end of the day, depending on how well you want to do it, you could easily spend that 150+ on supplies...
If you did want to do it yourself, id block sand and free sand the area (depending on the surface) with some 220 grit...go past the area until you are sure the paint wont pull. Then wetsand with 320. If you really want wetsand to 400 grit. Try not to burn through the oem paint or primer, they will make for a stronger adhesion base. After you do that, you'll have to get paint and primer and clear for the sanded area. You'll probably have to go with an alternate color to your straight color because of fading, but try to match the color, it wont be perfect though. Go ahead and shoot primer, wetsand again up to your desired grit. Now clean the bumper of all dust and wetsanding residue, and with wax and grease remover right before you shoot it with color. From here I wouldn't touch the bumper with your bare hands, the oils in your skin can screw up the paint. Now make sure you're painting in a fairly dust free environment, if you have to shoot the bumper in the garage, setup drop tarps and wet the floor to catch dust and overspray.
Now obviously you should have removed your bumper, removed bumper lights, and should have masked off your grill so you don't get overspray on anything.
When you shoot color, you are going to want to shoot the repaired area and flare your spray at the end of each pass, and try to blend the color to the other...once that's done you'll want to shoot clear. The problem with shooting your whole bumper is it wont match well...if you blend the difference in new vs old paint is less apparent.
There's a lot of details missing here...honestly if you don't know how to do paint, id suggest finding someone to teach you so you learn or pay to have it done.
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