This elevated form of Papier Mache has been developed by Tapio Säkkinen, Head of Set Workshop / Environmental Head at Finnish National Opera and Ballet as a biodegradable, renewable alternative to fibreglass and plastic based coatings. It’s basically raw paper pulp board that would otherwise go on to be processed into other paper products but in its raw state, it’s fibrous nature makes it perfect for heavy duty Papier Mache. 
To use:
• Tear sheets to create feathered edges that become seamless when overlapped.
• Dip into water.
• Then dip into PVA Glue thinned with up to 25% water, if necessary, you can also add a flame retardant at this point. Most all-purpose flame retardants would work but Bio Retard is designed for cellulose-based materials.
• Squeeze out as much liquid as possible, you can do this best by laying out the wet paper on to a wire mesh and squeegeeing out the excess moisture.
• Drying times vary and depend entirely on ambient temperatures but a layer should dry if left overnight somewhere warm. In a cold warehouse it could take many days!
Can be used to coat polystyrene or chicken wire frames, one layer will give a tough impact resistant surface. With the use of a barrier coat or release wax you can even cast the paper into moulds. Scan the QR code for step-by-step instructions and Tapio himself standing on a bowl made from the eponymous paper. Upeaa!