Before storing my ammo in military surplus ammo cans, I would like to lube up the rubber seal to keep them from cracking over time. Does anyone know which product would work best for this? I was thinking BreakFree CLP or Vaseline. I can not find any information on whether BreakFree CLP hurts rubber or not, and Vaseline is messy. So please give me some advice and details of what you would use or have used. Thanks.