I just used a bunch of these weld beads on a Tamiya SU-85 and Italeri Pzkw-IV (stash builds for AMPS).
They are da bomb !!! They are very easy to use, and they really add to the look of an older kit.
One thing I found with the weld beads is to trim the decal film right up on the edge of the bead or else it will show under the paint. As Kurt notes, decal-setting solution doesn't seem to do much. The first few I tried lifted off a bit. After they dried I ran a bead of ordinary plastic cement down the bead to try to seal it in place. Then paint on top of that. They look great. Again, a lot of older kits lack weld beads. If you are building one of those, this is a very easy, cheap, fast way to make them look a lot better.