Gearbox Tunnel Cover Seal

[MotoPsyche@aol.com]

What are some effective ways to seal around the mating surfaces of the 
gearbox tunnel, short of pumping in silicone sealant? I have a metal gearbox 
tunnel 
that was only held in place by three bolts. I've now got all the captive nuts 
cleaned out and should be able to get bolts in almost all the holes, but I can 
see that it's not water or oil tight...yet.

Thanks for the tips.

Bill Stagg
1960 TR3A