What about fresh air? Do you have windows near where you are spraying? The spray cans that I have used always warn about having good ventilation...
My husband puts saw horses in the garage ( in cold weather) or in the driveway (in nice weather) we cover with plywood and an old sheet over it.
usually a good sized lap quilt will fit....otherwise, between the two of us, we do a portion of the quilt and then move it along the board to finish it.
Goes pretty fast with two sets of hands and there isn't that much clean-up outdoors...pull the sheet off, into the washer and dryer and clean-up is finished.....hubby takes care of the saw horses...etc.......
Just another quilters' suggestion.....
MaryJane