Well I recently gave up injecting and pouring soft plastics about 3 years ago, I am just now starting to get back into it and I went through a few bags of baits that have been sitting in my room for atleast 2 years. All the bags that I went through were extremely oily and put off a chemical odor, I only used “do-it” plastisol and “baitjunkys”, while baits junky’s being the considerably better plastic to work with IMO as far as clearness, bubbles, yellowing, and the quality of the plastic overall, both brands still put off an incredibly annoying odor, I’ve noticed that no old packs of the “big name” brand baits put off this similar odor nor do they become oily.