Dave,
The sap bleeding you are experiening probably has moore to do with the section of the log your wood was cut from. I am assuming you are using AYC(have read many of your post), and being a member of the cedar family contain a fair amount of resin located in the sapwood and heartwood areas. In AYC it would be very hard to distinguish between the heartwood and the sapwood when getting stock. If in fact your plugs were subjected to a very hot roof temperatures, as you state, they would certainly bleed.
Hopefully the bleeding has stopped...if it has, then you can waash the plug with acetone (fast evaporation) or tolulene(slow evaporation) but not in the Man Cave, and not barehanded as these cleaners go directly to the nervous system.
I would seal the plug with any oil (alkyd) based sealer, even thinned varnish. I stay away from shellac or lacquer based sealers (these are not waterproof) for exterior aplications.
Hope this helps
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