Using glue is a good idea but in most cases it will come off after a few washes (may need to re-glue compared to sewing). I tried putting a layer of lace underside (and look at it from the top) and it looks kind of strange that the entire "scalp" is darkened (very different from the skin tone). However, skin unit looks much better that way (need to stretch a bit so as to get rid of the "greasy effect" as just stretching ST-30 to remove the "shininess"). Anyway, will try it on an old unit someday.

Thank you guys.

Greenery