Ounces count and applying epoxy in a non structural setting is just wasted weight. I thought that spraying varnish as opposed to brushing it on would also save a few ounces, so I spray varnished the entire wing after assembly and used an acid brush to go "where no varnish has gone before". Tedious? Yep. But no more so than the other tedious parts of building the wings. Did I waste a lot of varnish as overspray? You bet! But that overspray weighs nothing. Studying the posts on this forum will convince you that there are many ways to accomplish something and the end result is the same. After a while I found it was best not to over think things and just build the darn thing. Most operations were much easier than I had imagined once I started.