Art, skim coating has become the norm on many high end paint jobs. It is a lot easier to get a lazer straight panel with mud then it is with quality metal finishing. Done properly it nets an amazing finish and is durable as long as the depth of filler is under .025" thick. It is another story entirely when it comes to making repairs. A skim coated car is a nightmare to repair.Sorry for the million questions - but I always seem to catch something you stated that I feel is really important. When you say to stay away from skim coats of body filler or glaze - I was thinking I would be adding a skim coat of body filler to the entire car over the urethane primer for the purpose of blocking and trying to have no more than 1/8" of thickness. I was thinking the high build urethane was to fill the sanding scratches in the filler or grinding marks in metal. Do I have that wrong?