Problems thickening a surface

[Sam.Gluskoter]

I have been messing around with sculpt and designing a car (just the outside) and everything has been going pretty well until I try to thicken the bodies to create a solid body. This face - highlighted below is not thickening. I try unstitching the rear of the car, and then I can thicken all but the highlighted face. I can't seem to find any problem to make it not thicken, so I was wondering if I was missing something or what to do.

[etfrench · Accepted solution]

One way to find the problem geometry is with the Divide and Conquer method.  This is basically divide the model (or sketch) in half.  Thicken each half.  If one half thickens and the other doesn't, divide the bad one.  Repeat until the problem area is isolated.

[mavigogun]

Ed's advice has worked for me.    Once identified, though, I've encountered stubborn geometry, demanding the application of some other tool; Offset Face, Thicken, Shell, Loft, Extrude to Object (maybe even Boundary Fill, though I haven't had much luck with the tool, yet)- they all may be exchanged at times, as needed, in attempt to step around the problem operation.    You may find once the problem area is identified that merely splitting is enough to allow the constituents to be Thickened, or you might be able to frame the problem area with Thickened parts and Patch or Loft across them.

[Sam.Gluskoter]

Thank you for the solution, I'll keep this in mind for future projects as well!