Top 10 Questions about PVC Trim | THISisCarpentry.31 Aug 2012 . Debbie: If installing cellular PVC trim with screws, I'd use Cortex screws and plugs it eliminates the need and use of nail hole fillers. If you plan on painting the trim, use any vinyl spackling. One type that is commonly used by contractors is Crack Shot by DAP. You'll find it at any local lumber dealer location.