I bought 1.5 lb. of real coal, crumbed up to roughly 1/4 inch size chunks, which I plan to use to cover the metal coal load in Lionel's recent PRR S-2. Since 1/4 inch pieces are a scale 1 foot which is way too big for locomotives, I plan to crush/pulversize this coal to a finer grain simulating real coal. I then glue a thin layer of this finer coal to the existing metal coal load - I am not going to disassemble and remove the metal coal load, etc.
Any ideas what glue would work best? I've never glued coal to metal before.
BTW - regardless of what I decide to do I will experiment before hand: I have a very old, worn Marx tinplate tender stamped with coal load I will use, etc.