Editing surface body Stl's

   I have a rather large file of a 3d scan of a jet that I have to do some work on. The scan was not perfect so I have to do some manual patching on gaps in the drawing. However, Solidworks keeps spitting back errors. With this being 3d scanned, I only have the surface of the model, so it imports as surface body. Whether this is similar to working with zero thickness or something of the like, it does not like the added mass and either says the curve is invalid or unknown error. Is there there a good way to work around this or increase the allowed size of solid body conversion for STL's.  

As part of the migration from the legacy Forum to the new SOLIDWORKS Forum, there was an overlap in timing where the new Forum was being loaded with historical data from an export migration, while at the same time, the legacy Forum was still operating during the period of March 12th to March 31st. Due to the overlapping timelines and import-export technical issues, posts during that time-frame could not have their media imported. If you created a post in the legacy Forum during that time-frame and wish to update the post in the new Forum with supporting media, please go to your post in the new Forum, enter into Edit mode and re-add any supporting media you want to insert.

The easiest way to find your posted content is: from the new Forum, click on your profile icon in the top right of the GUI, then select "My Profile" and you will be taken to the "Overview" tab where you can see all of your posting history.

Thank you