Using a paint pen to hide decal damage.
My 5th wheel is stored in the yard and I do not have a shelter. Probably should get a cover, but...
Anyway, the continual exposure to sun and heat (plus rain and cold, I guess) has damaged the darker colored decals, causing them to shrink and split like dried mud in a creek bed. You could touch the camper wall and feel the decal areas were much hotter than the white areas.
I colored in the cracks with a black oil based paint pen. DO NOT use the water based kind or just a magic marker. You can get oil based paint pens from art supply stores like Michaels or Hobby Lobby. About $3.00.
Here's the results. I guess I should have taken a "before" pic. Auto parts stores and car dealers carry a paint pen touch up kit that comes in a wide range of colors if the basic colors at crafts stores aren't what you need.