Are these fully enclosed surfaces? if so select all the surfaces and 'knit'
them and select 'try to form a soild' (look up the terms in help if you are
not familiar with them) if you are representing a flat surface but meaning
to have say a sheet material like a sheet metal part you will need to
'thicken' the surface, in this case why did you not use the sheet metal
features and avoid this?. Last is sometimes if the first example is your
problem and you cannot 'make a solid' then your modeling will need some
Why did you use lofted surfaces? could you not use a lofted boss or lofted
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