I had a child's scooter tip over onto my car, creating these scuff marks:
I'm not worried about the small nicks and scratches, but rather the two bigger scuff marks, especially this one:
...which is long and very irregular. I've already read a number of threads and online help about fixing chips and scratches, and I've decided on using Langka. I've got some touch paint and clear coat from my dealer. My questions are:
1. What do people think about mixing the paint and clear coat, as Langka suggests, instead of separate layers?
2. Does the irregular and uneven pattern of my scuff mark make my approach any different than if I had a well circumscribed rock chip?
3. What should my approach be to prepare the area prior to applying the paint - just a cleanser, or maybe partial sanding of the area, or something else?
Any advice is appreciated. Thanks.

I'm not worried about the small nicks and scratches, but rather the two bigger scuff marks, especially this one:

...which is long and very irregular. I've already read a number of threads and online help about fixing chips and scratches, and I've decided on using Langka. I've got some touch paint and clear coat from my dealer. My questions are:
1. What do people think about mixing the paint and clear coat, as Langka suggests, instead of separate layers?
2. Does the irregular and uneven pattern of my scuff mark make my approach any different than if I had a well circumscribed rock chip?
3. What should my approach be to prepare the area prior to applying the paint - just a cleanser, or maybe partial sanding of the area, or something else?
Any advice is appreciated. Thanks.