Does Matte Dura-Lar need to be sealed when using mediums such as; colored pencil, pastel, graphite, charcoal or crayons?
It is not necessary to seal the Matte Dura-Lar, but a matter of preference desired outcome and framing plans.
If you choose to seal the Matte Dura-Lar we have some suggestions, but we strongly recommend testing yourself and also reviewing the Manufacturers guidelines for their products.
Krylon Workable Fixative
Krylon Gallery Series Archival Fixative (has UV protection)
Sennelier Matte UV Protection
Krylon UV Protectant
Acrylic Gel Medium