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Spar. you can also dip a few times in between drying and build up a pretty strong coating but I see no need for that. I like the relatively quick drying of the product. Some even use it as a top coat, even some that are selling plugs so I guess they feel it is durable enough for this application, although I feel it does not hold up very good and it is not good for that, but that is me. The sealing is more for the inside holes and end grain of the wood, IMO. The epoxy,and back in the days of lead, the paint is the outside protection, hopefully. Like Mike said once the hooks get into the wood, but inevitable.
You can also use the heated plug and epoxy to seal method. I use that a lot too, especially for soft woods like pine, red cedar and hard woods like birch and maple for darters. I feel you can control the weight gain on the darter with the epoxy more than soaking it but I still have some learnin to do with this plug as some swam great and some didn't and they were made exact and with the same stock but that is a whole different conversation so I will quit that.
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