Hi James!
I have switched to the Molotow REFILS, usually available wherever you buy the pens. They are more expensive, but allow you to pour the needed quantity in a spoon, and brush-paint it on your model (very fine or medium tip brush works well). My experience is that a UNIQUE and VERY WET brush application will do. Avoid touching up what you just brushed, it will marr the uniform chrome surface. If you need to do touch-ups, wait at least 24h for the wet coat to fully cure, and cover the whole surface again, not just the blemish, because your touch-up will be too apparent..
Usually works great. Good luck!
CT