Hi Ron,
Is this polish the liquid stuff with the applicator right on the bottle? That might work like a stain and not leave a surface coating to cause any stickiness.
I personally think that the drop on scenic cover is the way to go and this would help make the uncovered face less noticeable if a cover was not available. To be effective the brown should probably closely match other "browns" used nearby.
Looking at the balloon today I wondered if even a grayish colour would be good next to the rock face in this particular case. So the colour selected maybe needs to take into account the particular module to which it's applied.
Be careful of the shoe polish -- depending on the composition, you may not be able to paint over it later. A lot of wood stains and various polishes are wax based. Might be worth trying some paint now, just to see.
Cool that it's KS! There's a "K&S" convenience store on Kingston Road I should get a picture of...