Warm the pre-cleaned paint with a hair dryer & leave the touch up pen/paint in a cup of warm water before you apply it.
Warm paint on a warm panel not only sticks better (ie. no runs etc) but adheres better in the long term.
Also a cocktail stick is perfect as your only dabbing the paint on, a brush
can leave marks & is harder to control.
Post some before & after pics for good measure!
