You will need:

•  Mod Roc
•  Mask
•  Basin of water

Instructions:

1. Cut short lengths of Moc Roc no longer than width of mask.

2. Dip length of Mod Roc into a basin of water and lay strips of Mod Roc across mask, leaving spaces for eyes, nose and mouth.

3. Leave overnight to fully dry.

All items, or similar, are available from Play Resource Shop & Scrapstore.