I discovered a helpful tip this week while working in my studio. I was painting on the backside of a page that had already been completed in my art journal and I didn't want to accidentally get the paint on the finished page so... I tried pressing a piece of Glad Press'N'Seal wrap over the finished piece and trimmed the edges close. It worked perfectly! I know this won't work for all mediums and you must be very careful when peeling the wrap off but I found it to be a tremendous help for me.
Let us know if you have similar tips to share that you've discovered on your creative journey.