There are a number of ways to finish the 100% sweep. In this video Erwon ( forgive me if I spelled the name wrong. Dislecsia ;) ) from 10th Planet Hollywood demonstrates a real nice flow.
First he starts by doing the 100% sweep making sure to trap his opponent's leg so that he maintains control of his opponent as he does the sweep. If he has kept his arms tight during the sweep he will be in the top position and possibly be able to finsish with a neck crank.
If that doesn't happen he can crawl his arm up and get a straight arm bar for the tap. If that doesn't work you can switch it to an Americana.
At this point your opponent's arm should be shredded but if they still do not tap you can transition to the S-Mount to land in the Spider Web.
