Sanding Guide Coat

70SwingerGuy said

I agree, the powder wipe on is better than the spray on, but is still susceptible to washing off when wetsanding. But I fear its the only viable option nowadays.

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I'm not sure what you're doing but I always do this on the last coat of primer. 320 grit dry sand with a soft block and that should find all the needed areas to be fixed. then sand it again with 500 grit dry paper or you can wet sand with 600 if you want.
I'm not the smartest guy around but been doing body work and paint for over 50 years and unfortunately still doing it.
I'm sure someone will chime in and prove me wrong as always but just my 2 cents.
Don't mind helping you if you need it.