Good questions. Let me give you an example program, which will answer all of your questions at the same time (maybe not in the order you like them to be answered, so please look at all of it before replying):
Originally posted by bennyandthejets
JasonD, if you delete the brush straight away, won't that mean you will lose the background brush before it's even used? When I was first trying brushes out, which was yesterday, I experimented on where to delete it. I found that you can only delete it after you never need to use it again, or else the background reverts to plain white. So how can you delete it straight away?
Also, why delete it twice?