i think DgAPc means Surfaces -> Extrude Surface.

That option does indeed work a lot better.

in fact the part on the pic where it is good is an Extruded surface.
and the bad part has been created with a planar surface.

i have updated the last pic on the page with some explanation.
https://www.lostdesign.be/maya/problem.htm

so basicly i think i shouldn't use planar surfaces...
the loft works great because it uses the same isoparms as the curve , and the lofted surface van be attached to the other surfaces , but this is not the case with planar surfaces.

but then how do i create something like i want to make in maya ?
its freaking me out
do all the models out there have gaps in them if you zoom into them real close ot what ?