ORIGINAL: JollyPopper
I have found that in situtions such as these, hitting the joint with a heat gun after slathering on the eopxy makes it flow like water. You can control its flow with the heat, and becuase while it is hot and flowing like water, it penetrates the wood better and fills the gaps more fully. A by-product seems that the heat shortens the curing time without losing any of the strength of a good epoxy joint. All pros with no cons.
That would work well with a kit built plane but to get the epoxy hot enough in an ARF your covering would be destroyed.