Just keep in mind this stuff gives you exactly as much as you put into it. Sometimes I loose patience and decide I'm not priced for glass perfection and you'll still be able to see a line. But you can get rid of it with another two or three sanding sessions and coats of paint. For example I lost patience here:   Basically, I do as much as I have patience for. Some other guys here on the forum are more painstaking and get better results than I do.  The method I use is this:  -1 coa