What can I add to paint to make it dry really, really quickly?

I printed out 3 courses of math, 1st and 2nd semester of each course. We’re talking several 3-ring-binders of paper. Well, then I realized that it printed out the teacher’s version, which includes the answer key. I don’t want to waste a ton of paper and toner re-printing them so I just want to white the answers out. However, I’d end up using 50 zillion white out brush things. Not cost effective plus it would be tedious and sticky. I figured I could get a half pint of white paint and a thin artists brush and do the same thing much more quickly and cheaply. However, I need the paint to dry as quickly as possible.
Would adding alcohol do the trick do you think? Any other thoughts?