Comparison Videos

I've seen one video comparing 3 different brands of purple paint pens. I thought that was very informative. There was a marked difference. I'd like to see comparison of .7mm paint pens, skin tones sets, sealers – applying , weather resistance, etc. Maybe set up some test rocks that we keep and set outside to document how they weather over time.Seeing a video comparison of 3 or more brands allows me to make a more informed decision on where to spend my Rock Painting budget and time.