Blacktop repair

I am getting ready to make an 8 inch deep by 3/4 inch cut in a blacktop parking lot for Low Voltage cable (lighting 2 islands in a restaurant parking lot.....anything for the
Who among the general contractors can suggest the best way to fill in the void left. Do I use blacktop patch or a blacktop compound that is applied with a caulk gun ?
With many thanks in advance.
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