Question About Painting

[jadawgis732]

I'm painting my DVD drive, and started by sanding with 150 Grit until the finish was removed, leaving it looking like stainless steel. I just applied two coats of gray primer waiting 15 minutes between each and left it outside to dry overnight. It just started raining here in NJ and I realized after 5 minutes that the drive was still outside. I brought it in, dried it with paper towel (none of the primer came off on the paper towel) but now there are water marks on the primer. Do I need to start over by sanding down or can I continue or should I just go with another coat of primer? Thanks