Painting with Woolite. Good idea or bad idea?

Asked by Nimis (13255) October 23rd, 2011 from iPhone

Thinking about getting a black light and painting some ghosts on the sidewalk for Halloween.

PROS:
– minimal holiday decorations to pack up at the end of the day
– drawings can be different each year
– would be kind of fun…

CONS
– run-off will kill the lawn?
– will discolor the sidewalk?
– will be sticky and attract gunk?

BONUS QUESTION:
How to jerry-rig a motion sensor light to fit a black light set-up? (Most seem to use fluorescent lights. Blacklights don’t…I think.)