It shouldn't take 2 weeks for the sealer to dry. Varnish ought to dry in a matter of hours. If you sand it and it comes off as powder you are fine. Valoil is good to go in 24-48 hours.
You should sand/wipe between the primer and the color coat.
If you are using rattlecans, some guys spray a clear coat and scuff that then wipe before applying epoxy.
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