Arlon DPF 3420 Matt polymeric calendered overlaminate. The DPF 3420 Matt is designed to provide an increase in UV protection and longevity for the printed media. The DPF 3420 is matched to DPF 4000 series and DPF 8000, the DPF 3420 also has a permanent pressure sensitive adhesive. The DPF 3420 is suitable for both internal and external application and can be applied over flat or semi curved surfaces. The rule of thumb is the overlaminate must match or excess the life of the media.