Completed scratchboard artwork is sprayed with a protective varnish and are actually more durable than you might think - considering the whole medium is scratching! I use a Golden Archival varnish with a matte finish on every single completed scratchboard. This varnish protects the artwork from dirt, moisture, UV damage, and MINOR scratches. The protective layer can be scratched through with a sharp tool or gouged with a sharp object, so the artwork does need to be protected