I used this stuff for a parking lot at a Condo Development I did about 10 years ago. It is quite expensive compared to asphalt or even concrete and can't really handle heavy weight traffic on it (like a dump truck or trash truck). With a fair bit of traffic it will eventually compress and fill...
I lock my rifle case using combination locks that have the TSA key port in them. Got tired of having them page me back to ticket counter or gate so I could open the case up for TSA to inspect, or worse, having them cut my padlocks to inspect. You can get the locks pretty cheap on Amazon.
They got a good shipment in this morning at Academy in Athens. Plenty of 9mm left (20-30 boxes) at 10:30. $17.95/box for Blazer 112 gr and $18.95/box for Federal 124 gr. Limit two boxes of course. Also had some 12 and 20 ga shotshells as well.