Lollipopsunshine

I’m about to embark on a tour to a number of theatres all with different requirements and regulations. I have three chairs on stage which are simple pre used household dining chairs. Normally I would use a water based fire retardant spray on anything wood or fabric but this is varnished so it won’t work. I don’t want to use FR paint as this would change the look which the director isn’t happy about. Is there actually any requirement to treat household furniture? Any advice much appreciated.