You can paint over the primer. But it is highly recommenced that you apply a good sealer over the primer, after it is sanded.
Primer is just used to fill scratches and leveling, like where you made a repair or are featheredgeing, the least amount you wind up with under the paint, the better the paint job will be.
Like blowing on flames says, you can get a flex additive at your paint supply store.
If you don't make mistakes. your not doing anything.
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