Hey Pumeco,  Here is a quick test with your idea.

 

Here I have taken my specular map, inverted it, the used it to control the max of a noise node, finally the noise and bump are adjusted to -05 <> 0.5 and then compared against each other and the max between the two is used for bump mapping.

 

Here is the shader (actually the complete skin shader) with the "finish" added and a comparison to without the noise and with the noise

TemplarGFX
3D Hobbyist since 1996
I use poser native units

167 Car Materials for Poser