Overspray on my 71 Duster. Mothers Clay Bar

It is a fairly long story but I tried painting the left front fender and the first two times I screwed it up. The second time I though I burnt the paint, but on closer inspection I found that the paint, (mine and the paint from before I got it) is coming off in huge chunks.
I figure that the primer the last guy used did not adhere to the car. So a razor blade is taking off huge chips of paint.
But the reason for the post is the last and hopefully final paint is looking good, and I guess I did not mask the car enough. There is lots of overspray.

I went to the parts store this morning and picked up Mothers CLAY BAR complete system to remove, among other things) overspray.

I did not expect it to work and the store agreed to accept a return if it did not work.
I mean to tell you that this stuff works wonderful. I had tried lots of different procedures with the tools and chemicals I have here and the results were very poor. But Mothers work great the first time and the procedure is very easy to perform.

I had to take a break until the sun stops shining into the garage so I can get the rear end. Not because of the Mothers, but I try to avoid the direct sun light, especially here in Arizona.
Hope this helps you all.

I am having problems uploading pix but will when I figure out this phone