Touch-Ups after Sanding TIP

Did you ever sand off an edge of a white undercoat?
This Little Green Man prototype had a glue blob on one of the toes.
After sanding it down, the white cover paint was removed.

I didn't want to spray another undercoat. That dark brown area could show through the light green color to come.

I sprayed a puddle of gloss white in a baggie.
A Q-tip was dipped in the white paint and the excess rolled off onto a paper towel.

ROLL, don't brush the white paint over the sanded area.
The paint won't stick if you "brush" it on. Roll it on like you were painting a wall with a paint roller.
I use Rustoleum 2X paint on most of my models. This paint accepts touch-ups well.
On the edge of a fin like this you probably won't ever see the added paint fill.