There are two spots on corners of the Jeep where the paint seemingly split at sharp bends in the metal - very small, about .25" in length. Both have allowed a a little rust to develop and one has caused a bubble underneath the paint. As a temporary fix I painted over the spots with touch up paint to stop further moisture exposure but I know that I need to permanently fix them so they don't spread. One is in the tub driver door jam area and the other is at a back bottom corner. Should I just mask, sand, touch up paint and hopefully it matches well enough?

 

yes. to stop rust you need to remove it then seal the bare metal. sand , prime , paint.