Hello Kero what I usually do when one of my pieces starts thinning out is apply waterproof mascara directly on the scalp where the thinning part of the piece will go. Wait for it to dry and do the usual from there on. If you get a good quality waterproof mascara it will stay on for a solid week. Last one I tried was the Avon type and the results were good. Hey it might be just what you need.