And another update...
I've been running with the resealed gasket for a week now, and while it was dripping happily when I first sealed it and the sealant was still not hardened, it has kept dry since then. The only problem I have had was a hose clamp that failed causing a small leak... No chain is stronger than its weakest link...!
I have no idea what this sealant does in the hardening process, but it seems to have expanded somewhat and penetrated whatever had cracked/failed.
I haven't tried a longer run in the high revs... I tend to keep her well below 3000 rpm in daily driving and I have deliberately only crossed that a few brief times. RPM makes a big difference in water pressure, so at some point I'll do a long run at high rpm to see if the sealant blows out
But in daily driving she's running soooo well... she's like an eel in the traffic
- Anders