Thanks both, looks like I'll be sanding for a week. I have tried taping, it helps somewhat. Yes Roy there's an alternative, just as good, I'm told,
UHU plus acrylit is a 2-component acrylate adhesive for quickly setting bonds on many types of material and also ideal for model making. Very strong, it covers gaps and is grindable. It is highly resistant to vibration. Working time is 7-10 minutes, curing after 15-20 minutes; grindable after 25 minutes.
It's cheaper as well.
Cheers both, Glyn.