I have an older home out in (what use to be) the country. It was first registered for property tax in 1930. It could be older. When I got it, it was an abandoned farm workers' shack. About 10 years ago, I decided to put crown molding up in a lot of the rooms. In the living room, I (meaning the guy I hired to work for me) put up a 2 by 4 around the wall, in a flat position, a couple of inches from the ceiling. Then, I put a 2 by 4 around the ceiling, in a flat position, a couple of inces from the wall. Between these 2 by 4's, I had the crown attached. That way, I could buy a regular sized crown, but get a big crown look. It turned out very nice.
In the winter, when "things" contract, I've got this ugly crack between the boards and the crown. When things warm up in the spring and through the summer, the crown looks great! I'm dreading winter because I know those cracks are coming back.
Any suggestions? Is there a miracle caulking out there I am unaware of?
P. S. The crown is painted white.