I came into a good deal on powder and primers at an estate sale. I now have more that I would want to store in the house. I live in the Wichita falls tx. I have an unlimited access to used pallets. I could make some boxes out of pallets, or just bite the cost and make boxes out of 1'' ply wood. I have a thought of making boxes with space between the inner and outer walls and filling it with spray foam. From what I have read the boxes should be able to vent in case of fire. The powder and primer will be stored in a building without air conditioning. Does idea for the boxes sound like it would work for the long term storage. thanks rrh