How often should I change out my "Sta-Wet Palette" to prevent must and mildew?

1. How often should I change out my "Sta-Wet Palette" to prevent must and mildew? I change mine every week by wiping it out and rinsing the sponge. If you watched Color 101, you might remember that Dianna Shynne uses blue shop paper towels in place of the sponge. If you use those, you can just throw them away when it starts getting a little bit smelly. Also, you can always use just a tiny drop of hydrogen peroxide which will kill the smell of mildew. Do you prefer to paint on a canvas panel or a stretched canvas?

2. 16:07 My preference is to paint on the stretched canvas because it's easier. You do have to paint the edges, for it to appear finished, but it keeps the overall cost down because you don’t have to frame it. You can paint the edges, attach a hanger and sell it for a little bit less than if you had to pay for a frame. Whereas with a panel, it will need to be framed to hang it. 17:22 If you are showing work in galleries, you want to have a very professional look. In modern contemporary galleries, artists often don't frame their work. But, in most traditional galleries, almost every painting is framed. When I started showing in galleries again, we began framing the smaller pieces but just painted the edges of the larger stretched canvas paintings where the cost of framing would be exorbitant (like maybe $1000). If I'm using the panels, what's the best and easiest way to hang a canvas panel painting? 18:24 The easiest way is to buy your canvas panels in standard sizes for which you can also get affordable frames. Good sites to look for frames and panels are dickblick.com or Cheap Joe's. For instance, for a 9x12 panel, you can get a frame for about $20 or $25. If you use a particular size a lot, you can order a box of frames with three or six frames in the box bringing the cost down even more. 19:32 As far as the time to prep a panel vs. a stretched canvas for hanging, it’s really about the same. If the painting is unframed you have to paint the edges, and if going framed you have to attach the frame. Both require attaching a hanger. If you’re selling your work, you’ll want to consider what your buyers prefer. Some people prefer the look of a frame while others prefer unframed.