I have not had a problem with glue lines at the fades and I have used .004 total taper between my riser and back glass. I cut and sand my risers to fit the form light tight and do not put tapers on the form for compensation. Seems like there would be a problem with fit when you think about it but I haven't yet. I do use good rubber strips on top of the form and under the metal pressure strip though. I think the use of good rubber strips makes any lanyap (slack) in contour disappear. I use c-clamps on the riser section to the point out past the fades which alows me to apply the necessary forces to make good glue lines. That probably is why I have never had a bad glue line, good pressure forces along with LONG FEATHERED FADES. Also, when I grind my tapers they really don't start the taper rate for several inches out. In other words, they are parallel for about 4 to 5 inches before the taper begins. Don't know why but that's the way it works out and doesn't seem to hurt a thing. Then when I splice them there is 8 or so inches of parallel in the middle of the long lamination. The important part is that the thickness taper is correct at the fade points anyway. And yes, sand them well after you glue/spice them together so there are no humps or gaps in the layup.