Sorry, I don't think the cement is the culprit. If the wrinkles ran vertically, you could make the case that the "orange peel effect" was showing up.
But with horizontal wrinkles...my guess is that you're gonna see them whether you cement or not.
Especially after you have turned your tops...effectively forcing horizontal wrinkles into the tops...the tops need to be stretched upwards while on the tree to one degree or the other.
As for what the cement is doing--it is reinforcing and stiffening the leg. It "persuades" the lining and top leather to act as if they were one piece instead of two.
Particularly if the lining leather is a different temper than the tops there is a good chance that just driving your foot into the boot will stretch the lining differently than the top itself. The results will be ugly...trust me.
If you use Hirschkleber...technically an actual
glue as opposed to a cement...you might get a solid enough bonding that by the time the glue dries and flakes away from the leather, the tops will be sufficiently broken in and sagging linings will no longer be an issue.
But I doubt that doing so will address the issue of horizontal wrinkles.
Again, I suspect that this is almost entirely an off-shoot of turning the tops and the way that a particular leather responds to that process.
If you're inducing wrinkles in one direction, it only makes sense that to eliminate them you have to stretch the leather in opposition.
Or you could try using a firmer lining such as kip...firmer than the tops.
And a line or two of inconspicuous stitching doesn't hurt whether the tops are cemented to the linings or not.
Tight Stitches
DWFII--HCC Member
Little Jack Dandiprat in a white petticoat,
The longer he lives, the shorter he grows.
(Message edited by dw on October 29, 2011)