Hi Henry,
To remove the rough spots in your primer, use wet'n'dry sandpaper under running water. I usually start with about 800 and then move onto 1200 and stop there. This not only removers the roughness, but also gives something for the base colour to "key to". You can go into 2000 but I find it doesn't make a big difference for me.
You don't have to use a clear coat, but I find that the results gets better , the more effort you put in............... Hate that¨
:flash:
Good luck!
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