I've actually done it....it worked great the first time and my canopy blended with the rest of my hair really well. Unfortunately it never really worked again. The next two times the perm fell out within a couple of weeks and I was right back where I started with hair that was a bit dry and damaged. I wouldn't bother doing it again as I think it's too damaging to be a long term solution. Now I just use a dab of Re:coil and plop and that boosts the top well enough for me!

Take care,