I’m building a Robbe (Krick Ro-Marin) Neptun tug right now. Don’t know if it’s the same glue, but I tried an acrylic epoxy a few years ago that went by the trade name of Fusion. It mixed up yellow, had a consistency of wet cornmeal, and stunk to high heaven. Don’t like it. I have a little of the Stabilit Express stashed away, but I’ve been using filled epoxy on my ABS builds and have had no problems. I’ve built 3 Graupner Micro Magic yachts, an old Robbe San Remo, and now this Neptun, and have had no issues with the epoxy bonding. One of the Micro Magic’s keel ox was built with the Fusion, the other 2 with the filled epoxy, no leaks from any. However, you do have to lightly “scuff” the mating surfaces with a fine sandpaper to get a good bond.
Cash