A 1/8" brush painting an element larger than a fastener head is the wrong tool — it will take forever and look worse.
Cutting in and trim painting — that's a sash or trim brush's job.
And it is not the tool for a repair larger than a point: a scuffed section of trim or a small panel wants a small trim or utility brush, not an artist brush.
Load only the very tip, wipe most of it back onto the palette or rim, and build the repair in small amounts
a point brush floods if over-charged. Feather the edges of a touch-up into the surrounding finish rather than leaving a hard border. Work in good light at a raking angle so you can see the repair level with the surface. Because the fill material isn't specified, clean it by the paint you used — warm soapy water for water-based, the correct solvent for oil/solvent media — flushing gently to the ferrule and reshaping the tiny point so it stays fine for the next repair; a splayed point brush is useless.
Asked before buying
BUYER QUESTIONS, ANSWERED BEFORE YOU ORDER
What's it for?
Point repairs and fine detail — nail heads, chips, scratches, stencils, model work — not surface coverage.
What are the bristles made of?
Not stated in the source — clean it by the paint you used; the packet doesn't specify fill.
80011 or 80012?
Tiniest points (fastener heads, pinpoint chips) → 1/8" (80011); slightly larger detail or small areas → 1/4" (80012).
Artist brush or trim brush?
Painting a small element (grille, muntin) → trim brush; repairing a point on it (nail head, scratch) → artist brush.