Newbie to anything like this.   Picked up a rusted old pot belly stove.  Removed the rust, and need to have a part or two welded.  I plan on using the stove outdoors to sit around in the winter.  This thing is about 5 feet tall.  When I reassemble the parts with new nuts and bolts.  Should I seal the belly top and bottom together?  I was reading that furnace cement does not expand and contract.  It has to the mixed type, which is not for metal to metal contact.  Is there a product anyone can suggest or is it unnecessary?  
Thank you for any advice
	
		
			
		
		
	
				
			Thank you for any advice