I've used international with no issue. 3 different cars, one is still bare (way to long and looks ok), One in primer 4 years, ok, one finished 3 years, looks perfect. Don't do trunks or hoods because of the inner panel sealing glue. If you do have a "fat" seam on a panel, pry it apart before sending it. Then put Pour-15 in the seam and tap it back down when the part returns.
Doug