Yeah, its really easy.
When I moven into college housing I had a dart board, and being young and drunk we would miss. When we moved out we freaked thinking we loose our security deposit.
The story is pointless, but what I'm getting to is that it is super easy to use.
sand the hole to smoth it out, using a putty knife-spread on the spakle, sand, and viola.
I assume you don't want to drill holes in the roof because you rent... I can tell you its okay, they paint when you leave so you can't tell after a coat.
It takes five mintes to do, and the supplies cost $3 total.
Good luck
![Peace :peace: :peace:](/styles/smilies/peace.gif)