Hi
i know that is answered lot of time and i search it.. so i find that in order to make a solid part from loft surface first you have to make an offset and then knit  and last thicken

i try to make a fender model from scetch and then with loft i make it to surface

as i want to run this model to cfd , i want to make it solid

i make it solid with all the above methods but always in cfd simulation the fender dont apear as a solid.. only the adges..

what i am doing wrong??  (i want to make a full model of a car but want to be sure that i am doing the right steps every time before i complete it and then cant use it in cfd analysis )

the perpuse of this is just educational - experimental

i attach 3 files to take a look and see what i am doing wrong

thanks in advance