Woops, I never replied to this! Yes, actually, PVA is exactly what I use But I only use it to connect the two (or in this case, three) feathers together. I spray the feathers with fixative to help keep the vane from coming apart, but mostly it's just a thin layer of acrylic where my subject will be to act as a 'glue'.
Thanks! Sometimes I worry that I abuse the whole secondary light source (because I use it a lot in my feathers), but I really think it helps the figure pop.