I am a little older than you, and have an older brother.
Back in those days, plastic model supplies, spray paint, bare metal foil and polish compounds were not yet available. However. my older brother, 8 years older than me,was an expert builder. Paints in those days on gave poor results, but there was a trick. I had forgotten that until I net up with master builder Olaf Wahl, now deceased. The 1950's era paint could be made to flow to produce spray like finishes. I have sooe of Olafs built models, and his brushed on finshes leave mine in the dust! My brother used that method, and my brush paint was way ahead of its time, and as I recall, sometimes we would use a polish of sorts once the slow drying enamel dried.