I was told it’s because both of these are non-hygroscopic materials (do not absorb water)…that’s why you have to use oil to ‘kill’ primers.Have about 90,000 primers just sitting on my workbench, and been sitting for the past 10 years. zero issues.
Have about 150# of smokeless and Black powder just sitting on a shelf also sitting for the past 10 years. ZERO issues.
No need to create a solution to a non-existent problem.