Sealing the edges

Okay, just trying to wrap my head around what need to do once I have the side skin on and before I install trim. I am going to do my trim similar to Barbs (b.bodemer).
But, before I glue and screw the trim on do I need to epoxy the edge where the top and sides come together?
I'm really confused on how to get that edge sealed.
Thanks, again, in advance.
Mk
But, before I glue and screw the trim on do I need to epoxy the edge where the top and sides come together?
I'm really confused on how to get that edge sealed.
Thanks, again, in advance.
Mk