I dont like that when the panel shop boys have done their stuff, they load the car up with body filler or lob it up as we used to say then sand down for this perfect, glass smooth finish. It isnt very pleasant stuff polyester body filler, i generally used a mask but lots didnt and i often wonder if they made it to old age. The same using the then new 2 pack acrylic paint full of isocyanate, a deadly combination.