Heat exchanger sealant

[gixxer6]

#553 sprung a leak last spring.  Antifreeze was leaking from the heat exchanger under the seat.  I am finally getting around to fixing it.  I took the top cover off, the o-ring looks nice for a 30 year old o-ring. 

What type of sealant should I use when putting it back together?  Will gerneral purpose silicone work? 

[john.0_o]

I would think any good rtv silicone would work,just don't use to much,and let it dry before you add coolant.