hey... i once talked to a guy who sold littleton shot makers about coolent....
he told me to save money buy using the "cheapest" liquid laundry detergent i could fine......he showed me the shot he made and it was fantastic!
You are running your shot coolant way to hot if it ignites. Also as any other chemical you must use in a well ventalated area. Anti freeze can be explossive if given the right air to vapor to temp conditions.
check out above link for a little more info.
How many cars have been set fire do to a coolant leak ? Im sure it has happened somewhere @ sometime but not many.