Semroc (Centuri) Excalibur KV-43 Build, Part 2, Fin Prep

The fins were removed from the card stock sheet using a hobby knife.
The ash left from the laser cutting darkens up the edges.

Trust me on this -
Wipe off the burnt ash from the edges before proceeding. Remove most of the ash with a paper towel.

Sand off the remaining ash and hold-down tics with a sanding block and 400 grit.
If the burnt edges were left on, it would be difficult to cover the dark edges with spray paint.

The instructions say to use CA glue to "seal" the edges and prevent de-lamination. TIP: NEVER use CA glue on a root edge prior to using wood glue to attach to the body tube. CA will seal the card stock (or wood) fin. The wood glue can't absorb through super glues.

I applied a bead of white glue to the outside edges, none on the root edge. The glue was rounded with a fingertip. This rounds the leading, outside and trailing edges a bit.

After this dries, sand and smooth the round bead with 400 grit sandpaper.

Run your finger over the edge. If you feel any roughness, sand again until smooth.