Press the flaps from the cut portion into the tar and then spread another layer of tar on top of the flaps.
How to repair a roof with tar.
If the cost of the roof repair is truly bothering you consider making your own temporary repair by tacking a tarp over the roof or cutting up some sheet metal into shingles and using these to patch the roof.
Rubber coat 57 roof tar.
There are also products available in a spray can form which work well.
How to do it.
Cut patch and coat.
Prime the repair area once the surface of the patch area is free of all dust debris and moisture apply the liquid asphalt primer to the roof surface with either a brush or roller.
Push the tar from.
Allow the primer to flash off so that there is no excess primer on the surface of the roof.
Leaks and other damage to tar and gravel flat roof are repaired by patching the roofing membranes and a temporary roof leak repair may be required before a roofing contractor can create a more permanent fix.
Fill hole with cement.