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rj
Airhead
I was hunting around to name a particular filler that works for the depth in one hit. Bonding vs multi finish is quite different, bonding is very good at building depth without compromising the structure and it still dries fast. There are some fillers like Murex but they're generally specified for outdoors because they use elements like ground marble to provide waterproof hardness.
By all means try multi finish, it takes longer to dry and tends to shrink away from the walls of the channel because it's being applied too thickly.