I believe clay is amazing. It just makes the blood vessels in the skin contract and expand.
Clay applied as paste together with manure in tree trunk rejuvenates them and helps them with diseases(biodynamic paste).
Humans are like trees ,their bark is our skin.
So i am thinking a good protocol would be like this:
1)Dry skin brush the body.
2)Apply herbal sprays to the body.
3)Seal the sprays with the clay paste.
Or even moisten the clay paste with these sprays.
Clay is like offering the body is constant subtle moisture that it really needs in the skin.