Red River Rocketry Starliner DST, Part 8, Sanding The First White Coat

After the gray primer was sanded down a first light coat of white followed.
After the white has dried you'll be able to see any glue fillet irregularities.
The glue bumps usually show up where the leading and trailing edges meet the body tube.

Here you can see the sanded area at the top of the fin. The white has been sanded back and gray primer is showing through.
You can be as careful as you want but there will probably be Titebond M&TG "boogers" showing up under the first color coats.
Lightly sand them down with 400 grit and the next color coat will look smoother.
This is an extra step that could bring your finish to the next level.

After all this prep the model gets another light white coat then the final "wetter" coat of gloss white.
The model is painted and overall white. The decals make the model on this one.