Use a fan to circulate the air toward the outside. Take plenty of fresh-air breaks. If you feel dizzy, headachy or nauseous take a break and go outside. Do not eat, drink or smoke while using hazardous products. Traces of hazardous chemicals can be carried from hand to mouth.
Smoking can start a fire if the product is flammable.
Do not mix products unless directions indicate that you can safely do so. This can cause explosive or poisonous chemical reactions. Even different brands of the same product may contain incompatible ingredients. Use it all up. If pregnant, avoid toxic chemical exposure as much as possible.