..SO THEY CAN get kind of expensive. I have MCS at least for now and grotesque ambient smells of grocery stores, as well as other chemicals ,(chemical isle) , and fragrances and perfumes give me horrid immune system symptoms.I have to wear something that BLOCKS all smells 100. To my surprise I noticed after about a month, the filters were getting clogged already just from ambient smells. AND I was starting to smell the ambient smells come through. I am around NO hard core paint etc etc , gas etc etc, or hard core smells at all. I do go to the grocery store and wal mart at least , 2-3 times per week total. But I get in and I get out. SO just know you may be replacing these at least once per month. SO that leads me to believe if you used them for spray painting a car, they would only be good for one hour.