The original empennage installation had no fairings at the leading edges of the vertical or horizontal stabilizers. I doubt fairings will yield any speed benefits, but I think it'll look better to cover the bolts holding the pieces in place.

I first covered the areas around the leading edges with clear shelf adhesive shelf paper. I've found that shelf paper is the ideal material in that (a) it's pliable enough to bend around the various pieces; (b) it's sticky enough, but not too sticky and it doesn't leave residue; and (c) the epoxy resin doesn't really stick to it.

After the shelf paper was in place, I used oil-based (not water-based) modeling clay to form the shapes I was looking for.

I guess I don't have a picture of the fiberglass layup while it was still on the plane, but here's a comparison of the fairings for the horizontal stabilizer leading edge. The piece to the left is as it was removed from the clay. The piece on the right has been trimmed to the shape I'm looking for and has had some filler applied.

Here are both of the horizontal stabilizer pieces after they've been trimmed and slathered with SuperFil filler.

This is the vertical stabilizer fairing after it's been trimmed and slathered with SuperFil filler.

I keep referring to SuperFil filler so I took a picture to show everyone. The filler is available through Aircraft Spruce. I can't remember the exact price, but a kit like you see in this picture is between $20 and $25. It's mixed 2:1. I bought a set of mixing spoons and usually mix up 1 tablespoon to 1/2 tablespoon batches.

UPDATE:  Since SuperFil can be mixed 2:1 by weight or volume, I've since started using a gram scale to mix by weight. I bought an inexpensive 0 to 500 gram scale from Harbor Freight for about $15.