He has recited and blown something onto the nails, and had mentioned that he has to spend almost one night (few hours) per nail. He is a Hafiz of Qur?an, and I?ve never seen him talk or commit Shirk. He said that the nails were an allowed channel (zari?ah), and the real powers to protect lie only with Allah s.w.t.
Answer
Some Amaliyaat (practices of the Aamils) are based upon experience. What you describe in your question is also one of their practices and acceptable in Shari?ah provided there is no Shirk involved.
and Allah Ta’ala Knows Best
Mufti Muhammad Kadwa
FATWA DEPT.
CHECKED AND APPROVED: Mufti Ebrahim Desai