As a lifelong AMA Free Flight modeler I used to go the long and boring sanding sealer route.
Then someone here suggested brushing on thin CA with a Q-tip.
Do make sure to do it outside tho. The fumes are eye-watering.
Once dry 30 seconds or so, break the glaze with 220 grit. Add a bit more CA if you see any 'holidays' and repeat.
This technique also works on nose cone or payload bay shoulders.
Kit (AKA Cranky Kong)
Total Total Impulse as BAR: 7,753.69 Ns (Equivalent to a 51% M motor.)
=| Calirado, Colofornia...what's the diff anymore? |=