This week were sampling some duck calls for production runs using Mossy Oak Shadow Grass Blades. This film came directly from Mossy Oak, not via Big Brain. It was the remaining 15-20m on a roll we have had for a couple months from a previous run of goose calls for the same company. We recently switched to Mossy Oak activator for testing (working beautifully, by the way) and also changed our automated spray guns to the airless type like those used in the Brain Pot gun (also working amazingly well), so we began testing some speed shapes to get our automated settings dialed in. We dipped a few speed shapes of the film, and were getting cracking in the blacks. We tried increasing the activator incrementally and started getting the blurred-image sign of over activating, still black cracks. Remember, we can adjust the amount of activator precisely with our automated system with all other things being fairly
equal between speed shapes. I grabbed another new roll of the same film, and the cracks were gone with the exact same settings. My best guess is that using the original roll for production repeatedly over a month's time in the summer humidity, then placing it back in the dehumidified office, caused the PVA to expand at some point cracking the inks? Maybe @studebaker
can elaborate since he is more involved with the intricacies of film make up. This film has a white ink backing over the entire thing also. We even tried increasing the dwell time to make sure the activator had enough time to work, and the cracks remained. If there are any reasonable suggestions as to how to save the film? I'm open to them.
So... cracked film that you can't get to go away? Try new film. We all know how many variables this process has, but it MAY be the issue.