While on this topic, a quick question in regards to paint. Would a good coat of white primer work as well as flat white paint?

And oldsanclem, with mold, is this true in most situations or is it from your experience (meaining conditional)? Could you describe mounting the mylar in more depth. Do you mean that having it flush against the walls will/might cause mold? If so, is it sufficient to have a few inches of buffer space between the mylar and the wall, and if that, then why pvc pipe, would it matter if it were mounted another way but still had the space? I don't think I'm really understanding it lol. Thanks for any help.