Shoe polishing screwup

[Redsoxwin]

Looking to see if anyone can help. I started to try to remove a food oil stain from a pair of Dalton’s. After trying talcum powder, renomat etc, I can confirm the rubber cement trick worked.
Feeling confident, I want after a scratch on the other boot, adding more and more polish until I created a dark spot. I went after it with renomat, and in my enthusiasm I wore off all the polish. So now I need help. My first thought was to apply renovatuer and then build up layers of polish. But when I add the renovatuer and polish, it makes the spot dark, almost black.
Is is a matter of letting each layer dry before adding more? Or do I need professional help?
Thought appreciated

 

[Anachronist]

Let it dry, usually the spot will lighten up. If it doesn't, I would gently try to clean the vamp afain with renomat, maybe even more evenly remove the polish and then treat it with a less oily conditioner (Dasco Leather Conditioner), which usually dries without leaving dark spots, but nourishes the leather like the Saphir renovateur. In any case, after putting the conditioners on, I usually give the shoes a day and a night for the stuff to seep in, because polish tends not to adhere so well to freshly conditioned leather because of the oils in the conditioner. Good luck in fixing it and view it as a patina opportunity

 

[Redsoxwin]

Thanks for the suggestions. Im hopeful letting it dry over a day or so after applying conditioner will minimize the dark spots.