Tecnically, if you are painting with hardeners, you have to use an air supplied hood. The filters on your regular mask will absorb the isocyanates for so long, then they won`t.
I have a MSA brand filter-regulator unit at work which will filter regular line air into breathable air. I still have to get the right mask to go with it, although I see there are set-ups to supply air to some of the regular filter style full face masks such as the 3M brands.
Currently, I usually use a full face mask for spraying the POR-15. I normally just use a half mask for enamels which I use as the top coat.
Phil: I like your system and have thought of assembling something similar although perhaps a little bit portable. Of course, the one concern is that you have to worry about the source of the air into the blower. Not much point to it all if the paint fumes are drifting or exhausting near to the squirrel cage. I`m sure that`s not the case in your stationary set-up.
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