Clear Alex Plus Acrylic Latex Caulk Plus Silicone. 40 yr. Just applied some and it seems to work better than the Elmer's glue I've been using. However it seems just a tad tacky. Haven't painted over it yet. For some reason I've had good luck with Elmer's glue for fin coating, but as of late it's not as flexible, and even sealing the fins before using the Elmer's glue the fins seem to warp.