I recently bought two 55 gal drums that were used to hold tomato paste. On the inside of the drums is a rusty colored lining of some sort, and I was wondering if this would be an issue. I will attach some pictures of it. Is it something that won't be a big deal as long as I season it, or is it something I should sand off? In one of the pictures I went over a spot a few times with sandpaper and got to bare metal almost instantly. Any help would be appreciated, thanks!