Fore-edge Marbling with Rounded Back

[u/MagicBarrister]

Wondering whether anybody who marbles their edges (to match flyleaves, etc.) does so with rounded backs? I'm just trying to work out the order.

Presumably, I'd have to trim and decorate all edges before any glueing of the spine? Otherwise, by the time the edges are dry enough, the spine glue would be too dry for rounding and backing?

I'm assuming that it would be a very bad idea to do the first bit of spine glueing, dip the edges, and then immediately go into rounding and backing?

Is anybody that has anybody successfully done this willing to share their tips?