Would this be suitable to varnish an indoor mural?
Artists' varnishes are suitable for protecting painting for everyday environmental factors. However, if you're looking for something more hardwearing to be sure then we do sell GAMVSM Golden Acrylic Mediums and Varnishes MSA Varnish Satin 236ml - this is suitable for both indoor and outdoor usage.
It is a Mineral Spirit based Acrylic resin system that forms a tougher, less permeable film than waterborne acrylic varnishes and can be applied to acrylic, oil and alkyd painted surfaces.
It reduces dirt penetration and surface marring, offering an extremely level film with less foam and fewer pinholes.
It can be removed with Mineral Spirits after drying and is recommended for interior or exterior use.
I hope this helps.