The main risk of using WD 40 is inhalation or skin exposure to its vapors, which may have adverse effects on health if inhaled over an extended period of time. This is because it has petroleum distillates, and ingredients, including kerosene and xylene, contained in the product.
Its fumes also produce eye irritation if exposed directly into the eyes and respiratory irritation when breathed at high concentrations, so proper ventilation must always be provided while applying the liquid onto surfaces it treats.
In addition, contact with the skin might cause dermatitis (skin inflammation), particularly among people who already have sensitive skin prone to irritations from chemical compounds like those found in such products as solvents and acids.
Lastly, storing containers containing large amounts of flammable liquids near open flames or electric sparks could result in fire hazards since gasoline fuels often contain hydrocarbons present within them too!
Therefore any use involving ignition sources requires cautionary measures. WD40 should be kept away from children and pets.