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Well, the 847 is ideal for the clam shell spaghetti seal because it does dry quickly and will hold that spaghetti seal in place. Otherwise, it has a tendency of popping out of the groove, especially in the middle of the assembly process. I laugh when folks claim those clamshell gearcases are easy to work on. True, most anyone could probably get one back together and working… But, sealed up properly, is another story indeed.
I feel your pain, nothing worse than having to pull one of those clamshell gearcases back apart after assembly. Cleaning up that 847 sealer is a royal pain in the butt. Again, the 847 is great sealer, but only when you can get the pieces together quickly before it dries. In the case of the clamshell gearcases, you actually want the sealer to set up before trimming the ends and assembly to ensure it stays in place during assembly.