1. Clecoed all three tail fairings in place. 2. Filed and sanded the mating edges of the upper and lower fairings so they match. This was an extremely iterative process, and I'll bet I took the lower fairings off and put them back on at least 3 dozen times. 3. Added another attach hole at the forward upper edge of each lower fairing, to improve the fit. 4. Used a cylindrical sanding block to file the interface of the two fairings so they match in thickness. 5. Marked and trimmed the forward edges of the upper and lower fairings so they match. 6. Trimmed the aft edges of the lower fairings to they match the edge of the HS skins, 7. Sanded the outside faces of the lower fairings. 8. Sanded all rough areas on the inside faces. 9. Cleaned and prepped the fairings, then brushed them with two coats of SmoothPrime.