Explain the extended metaphor of Liberty Paints in Invisible Man

The narrator's entrance to the paint plant is ominous as he must cross a bridge in the fog, implying that he is unable to see out and around him, and then he descends into a swarm of workers, implying facelessness. As he emerges into the plant then it seems as if he is merging with it too, being sucked up, losing sight and identity. Paint as a substance suggests the property of coverage, of hiding the material beneath the surface with a new, suffocating coat. By joining a plant which produces this covering substance, he becomes one of the tools of its creation. Ironically the companies name is Liberty Paints.