The fent diffuses from the matrix in the solid piece through the sticky part into your skin (or in this case alcohol). I don't think you need to scrape anything with your nail.
I thought Dimethicone NF was Fentanyl. I was just asking cause I did the extraction, scraped the sticky side with my nail and it came right off.. Didn't know if it was adhesive or if there was fent on it.