This depends on what you want to frame. The most vulnerable mediums all but require adding a mat and
protective acrylic front. Pastels, watercolors, pencil drawings, charcoal art, and vintage documentation
need to be well-preserved. Mats create added space between your art and the acrylic front to keep air
circulating for preventing condensation build up which can lead to mildew or buckling.
Typically, canvas paintings do not have mats or an acrylic front because the last layer of varnish adequately
protects the painting for preservation. Photography, movie posters, typography and other prints don't require
a mat, but their presentation sure does have an added pop when paired with the right mats. And you still get the
extra level of protection with better air circulation to prevent condensation buildup which can lead to mildew
or buckling over time.