Listen to the experts. Been welding galvanized sheet in my car - cursed from start to finish.
Followed all the precautions - always wore respirator, still got sick. 2 weeks ago I vomited my guts out.
Feels to me like the zinc also sticks to your skin, especially face.
Also found much more spatter - stay away from it if you can.
Made my final weld today - praise the lord, will never weld galvy again.