Try our re-instated info resource - "Aladdin's Cave" (Main menu)- sorry it's taken so long to fix
You can also use Yamabond. I've bought Hondabond a couple of times in the past and it's excellent but expensive, £18 for a small tube of it. The really annoying thing about it is it goes off in the tube over time. I have tried most things such as stretching a piece of rubber glove over the end before screwing the cap back on, blocking the tube with a screw down the end etc but nothing seems to stop it. Being solvent based once the seal is broken it will tend to evaporate and I'd guess they are all the same.
Have you tried keeping it in the fridge? Should prolong it somewhat
This is a very good seiries of five videos on rebuilding a CB400F engine, full of tips and tricks too: https://www.youtube.com/watch?v=vR-MiqdHi1w&t=36s