The Army Painter - Gamemaster: Matt Sealer

Gamemaster Terrain Sealer is the ultimate sealer when building terrain and scenery. This high quality water-based sealer will keep your terrain protected from chipping and will help seal effects. It has a matt finish, is non-toxic, odorless, and will not corrode your building materials – no matter if you’re using XPS foam, polystyrene or MDF sheets.

Also check out The Army Painter - Warpaints Effects: Anti-Shine Matt Varnish (18ml/0.6oz)!