I want a longer open time glue and UF fits the bill. Does it irritate
your nose, breathing, or skin? Is it only a problem when it is in
powder form and floats in the air during handling? How about when
sanding through glue lines?

There isn't a better alternative is there? I don't want to use the
foamy Gorilla Glue type glues.

I want performance on a par with Titebond but with a much longer open time.

Dave