yes sand lightly dont cut through the variprime flash time is air dry 5 mins between coats. priming30-45 mins. max dry time 24 hours than sanding is req i used it on my car good stuff your going the right way
The way I use it is to put on a light but complete coat of VariPrime, let it flas for 15-20 minutes then put on a couple of heavy coats of catalyzed filler/primer. This gives good adhesion and is ready for block sanding, sealer and finish coats.