I often have some sort of cut or scrape on my hands from doing jobs around the house, and I often get mat burns on the top of my feet and toes from BJJ sparring. I have tried to tape these in the past, and it takes a long time to tape, and it never lasts during a training session when it gets all sweaty. Lately, I have been using New Skin, a brand of liquid bandage. It has a small brush applicator, and I have been applying a few thin layers to the cut, and it works great. I have even used it as a preventative measure, applying to places on my foot where mat burn has occurred in the past. I think there are several different types of liquid bandage that would work.