The burning is an unpleasant side effect for the exposed contractor. However, the characteristics of these compounds in the coal tar are what give the coating its water resistance, oil resistance, and other chemical resistance. Asphalt emulsions do not burn but can also have carcinogenic compounds and can lead to other skin disorders. Asphalt emulsions do not match the water resistance and oil resistance of coal tar emulsions. However, they are catching up as research dollars are spent to bring new technology to the industry.
Coveralls are available from most manufacturers.
Uniform companies will gladly rent uniforms that keep the contractor protected and looking clean.