I have never been able to use or trust that I was using one correctly, much either, although I have tried. They all say to do it, so they are probably right. I have had enough headaches to wonder.
I have just tried to stay outside with the painting, or have a window open for the glues and such.
However, as many as I have built over the years, I have really never been as gung ho on perfection as a lot of you guys have. I really never got caught up in having everything just so.
Sorry, not much help.