OK, that's easy.
1. It's never a good idea to pay a contractor for unfinished work that they can't 'get around to' right now. Just no. (And, I am, or have been, a contractor!).
2. If he's sure, tell him you've heard some conflicting reports, and would be more comfortable if he'd give a written 1-year warranty agreeing to bear all costs of repair the streaks, if they don't go away like he's sure they will. You'll find out real fast whether he's REALLY sure or not.
If he's actually not sure . . . your next step depends on the contract you have with him.
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