Reply by wisno

The water based is a quite safe material. I never heard that a water based materials ignite and spark itself and cause fire.
But the finishing room with solvent base material can be very dangerous place. A rag that is wet with glaze or oil finish are easy to get ignite itself.
There is a story about the glaze that was burnt itself in a furniture factory.
The glaze rag that is ignite and burnt itself..

-- http://www.wisnofurniturefinishing.com/