I'm a full time Firefighter/EMT and a previous Army Combat medic. The only real place you would need to place this type of clotting agent is for an inguinal wound. Where your leg meets your body. For any other wound, especially an arterial, nothing beats a tourniquet. You can make them out of easy to find materials, shirt sleeves,belts,bowstrings, anything that you can use to stop blood loss. I was taught in Medic school, that you have about six hours after applying a tourniquet before necrosis or tissue starts to die.
For smaller wounds such as on your hands,feet or anything not life threatening, super glue is your best bet. Easy to carry and works really well. When I was in Iraq as a Infantryman, my medic carried several tubes of superglue. Easier and faster than a bandage.
If you are going to use this "quick clot" product, never apply it to your head or neck due to you not knowing the full extent or your wounds. Head wounds are known to bleed alot, if you apply this to a head wound that has a crack in your skull, you have more problems than just a bleed.
All in all,to stop bleeding, pressure points,heavy gauze applied with pressure, and tourniquets for arterial bleeds is the best way to go. Just my opinion.