It's hard to fully appreciate the scenario I created here. Anyone familiar with Dexter will understand what it must have looked like to anyone peering in the window: plastic sheets, covered in red, with two severed hands on the floor, and me wearing a ventilation mask and protective clothing, with plastic bags on my shoes. So, I decided to cover the window with newspaper. Much less conspicuous.
To my relief, this paint dried in minutes, and a clear coat was applied shortly after.