Question: With this pen, do I just wipe it over the scratch.
Answer: Well in theory yes, but the problem is you may have waxes and contaminants on there. So you should clean the area that is scratched first by washing it the wiping it with Isopropanol (IPA) this will leave the surface ready for the scratch pen. When applying to the scratch do it in thin coats building up the scratched area to be at the same level as the rest of the paint, leaving time between each coat until dry. When it is dry if you want to make it invisible the you will need to wet flat it it down with 2000 grit wet and dry and then polish with a fine compound then wax.