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1) Not really, except that you should have used gray for the first few coats, before white primer. There are only few white primer that can hide the color of plastic, and as you know, Tamiya white primer isn't.
If the surface looks like a sand paper, the primer must start drying before it reaches the object, so you can shorten the distance just a little. If it's too close, it would cause the orange peel effect, so be careful.
2) Sand and remove white primer as much as possible, then use gray for one or two coats, then use white primer. Or use one of those paint remover to completely remove primer.
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