Ive done whole car gun metal gray dips. For some reason that does have a blue tint. If you want a nice GMG mix 75%gmg and 25% Black. If you want a gloss look just spray over it with glossifier. They also have a pearlizer finish as well as a metallic finish you can mix with the paint.

 

 

If using plasti dip, anthracite or storm cloud gray (pigment) is the color to go with.

 

good idea on repaint