It`s not as brittle or delicate as you might imagine --yes you have to be careful not to try to tear it off your head without first weakening the glue /bond with the releaser fluid, but in normal use and wear, it`s quite robust.
Concealer products are available which you can spray -on from an aerosol tin, or sprinkle in -- the material bonds/ sticks to the hair and makes it look fuller. There are drawbacks with them in that rain can make them run down onto the face/ forehead, and many of them, when applied to the back of the head, can stain pillows and bedding ---if you run your fingers through the hair, they can also be stained. Concealers are purely cosmetic and to `` fool the eye`` -- like anything, there are pluses and minuses. Paul.