So stupidly, I got a tube from Bruce yesterday, opened it in the kitchen and laid the posters on a counter that still had some grease on. Every poster got a little spot of grease, about 1 inch wide, which I can't stand, and in typical fashion, I threw all of them away. There goes $150. Retrospectively, maybe I should have asked someone in the know if there are any ways to eliminate, or at least attenuate grease spots. I didn't have the patience yesterday, but maybe it can be helpful for the future.
T