micray:
1. Make a copy of the paths;
2. Start a new layer; Paste;
3. Remove fills and strokes;
4. Draw a rectangle that's larger than the artwork, fill it with any color;
5. From the Pathfinder palette flyout, under Pathfinder Options, make sure to click on "Divide and Outline will remove unpainted artwork";
6. Select all, then in the Pathfinder palette click on "Divide";
7. With the group select tool, select only the rectangle outline, and delete it;
8. You should now have complete closed paths, already filled and everything.
There are also Illustrator scripts available to do this, you can search on Google for Illustrator Scripts.
HTH
Bert
Bert Philippus -