+1 for touching up the spots with acrylic paint. I'm not sure how confident you are matching colours but if you're not super confident there are some good youtube videos.

A very fine brush and a small set of process colours won't cost much (if you don't already have any). With the process colours (cyan, magenta, yellow, black) + white you can match almost anything you need to.

One good trick (if you're not confident matching colours, and have access to some photo editing software) is to load a photo of the guitar, select the colour you want to match, and then simply read off the % of each process colour. I have a friend who is an amazing artist, but colourblind. He matches colours using photoshop and just mixes using the cmyk % he reads off the screen