[Russell Ashley]

Steel Rubber has the tape you are looking for to set glass in a metal channel. It comes in a couple of thickness's and I think they will send you a sample of each so you can decide which you need. When using it you clean the glass perfectly clean and clean the channel as good as possible. Measure off how much you need to go around the glass and cut it off, roll it up loosely , and put it in hot water for a few minutes. Then you wrap it around the glass, don't stretch it, fold it over the glass, and then put it into the metal channel. Then you carefully tap the glass into the channel with a rubber mallet, or tap the channel onto the glass, which ever way as long as you get the channel seated fully. Let it set for a while and then take a razor knife and trim it along the channel edge. It's not difficult if you take your time.

NOTE: Re-read your post and it sounds like you already have the setting tape. The instructions I gave worked perfectly for me so I hope it works for you.