I built a new house about 5 years ago and the cathedral ceiling has cracked along the peaks and in one place down from the peak. They are just hairline cracks that I am guessing are a result of the house settling. I am getting ready to repaint the ceiling and I want to fix the cracks. Does anyone have a suggestion on the best method to use for this? They are 15 foot ceilings and I don't want to have to do it again for at least quite awhile. I have attached a picture to show what they look like.