In all my years doing this chorebIve always used Tamiya flat white. But last year I changed to Vallejo Ivory. Paint consistency is everything. And always go back to front so you dont drag you hand over you work. Then Practice, Practice, Practice.
Really nice job with these - yes, 1/12 scale should make it easier! 😅 I'll have to get some of those thinners. Also, good that you had already put it onto the wheel - I once painted whitewalls onto some tyres and then as soon as I put them onto the wheels, the paint cracked and fell off.