I don't know if this can be done but can you make piping gel stiff?
You would have to make it from scratch, and add more gelatin to it. The problem there being, how much gelatin is too much? Do you still want to pipe it, or use it for a water effect?
I bought pre-made gel and i want to use it to write a name on fondant
The only problem I can think of you having is a heat issue, if the gel starts melting down the cake.
Colette did a poinsettia cake, where the flowers were piped all over the cake, tops, sides, etc., and the gel held in place. If decorations that heavy will stay, I do not forsee you having a problem with just a name.
You can always test it. Cover a small cake board or piece of cardboard with some fondant, then pipe it on from the direction you will be piping it onto the cake. Prop it up to hold it in place, and see if it stays.
Thank you I will try and see how it goes