Possible Water Pump Leak?, impeller shaft, radiator hose

Hello,
My question is about a possible water pump leak on my 1970 Dodge.  I noticed a small amount of coolant has been dripping the lower outlet - just above where the lower radiator hose is attached to the pump.  

I can't see from where this is originating, but I guess it has to be either the pump or the thermostat housing above it.

The strange part is that when the engine is running or for several hours after, it doesn't seem to leak at all.  But when I leave it sitting for a few days, I notice this small puddle and see the traces of coolant in the area I mentioned.

I'm not sure what could cause a situation like this?  Can I try to somehow trace this?  

Lastly, would a product like those Bar's Leaks additives be helpful or harmful in this situation?

Thanks very much for any tips on this!

Answer
Hi Brad,

I'm placing my bets on the weep-hole. Under the impeller-shaft (between the impeller and the pulley) there is a small hole used for the purpose of leaking when the bearings start to wear out. You need to replace the water pump to stop the leak as the bearings have worn passed the point of usefullness.

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Thanks for the question, I hope this information was helpful to you.
Fred
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