Okay I think I get it.
what I should find is a line of brass that has bonded the two pieces of metal. Like wise around the back of the seststay I'll likey find a crack with brass binding it together. I need to remove the blobs on top to be sure the cracks are bonded with brass and just covered with a blob of it?
yeah the spot you see there below there seat stay cap was just poor decision making on my part. I was pulling paint off by lightly touching a sander wheel to it, and when I turned it on its side to get at an angle the metal wheel caught the seat stay. I'm going to stick with hand tools from here on out.