Wendell. Good choice on using 00 silkspan. The solvents in dope are similar to what kids indulged in, in "glue sniffing". In heavy concentrations you can get high due to oxygen deprivation. I've used dope for 60 years without a respirator with no problems, but would recommend good ventilation. Always keep in mind that many of us react differently to different chemicals. So what doesn't bother me, might make breathing difficult for you, or someone else in your household. Just use normal precautions that you would use with any paint products used in your home, or garage.