How to add a material thickness to a surface

Hi all,

How can I add a material thickness to a surface trimmed from IGES file?

I have a surface imported from IGES file, then trimmed to a single surface in SW that I would like to materialize.

I tried times for thickness, but Solidworks doesn't like it.

Neither can I apply Shell for part, nor thickness adding from Sheet metal.

It is a 3D Lofted surface, very simple single one.

Any thoughts, please advise.

Best Regards,

Wayne

SolidworksSheet Metal