I don't think touch-up paint should really be used with an expectation of it looking "good." Rather, it should be used to cover bare metal in the event of a rock chip. to prevent rust mostly and also so that it doesn't look like complete ****. To expect it to look perfect is folly.
All the body on the LR3 is aluminum right? Exposed, it might be susceptible to corrosion from Mag Chloride ice melt, but it won't rust.