I did this years ago and it didnt work. Dirt got stuck in the gaps. I ended up using fasteners3M VHB. If you are worried about the grey just put a white strip on the track.
Yea that happened too. I ended up scrapping the whole panel and starting over.Or worse, the tape stays tacky and the letters get hung constantly. Especially when people think they have to slide them all the way in from one end or the other...
update on this...
I ended up using E6000....it worked fine(so far), but the project had it challenges...and I wont ever do another one...LOL