I could do with some help on this one…

I recently wrote I was negotiating a sale of a print

Well, I’m still negotiating! Main sticking point now is perspex or glass. Glass is expensive and heavy in large format frames, but the potential customer is a heavy smoker (yeah, I know but it is Spain), and the guy has been scared off using perspex by that stupid frame shop I wrote about in an earlier post, who said that perspex needs replacing twice a year in a smoky environment… any ideas?