I suggest making a sandwich patch of two 3" diameters of tramp material, or woven fiberglass cloth, and a "filling" of 3M 5200 sealant/glue.

Follow this up with two or three circles of circumferencial stitching around the burn hole, using a hand operated manual stiching needle and spool, available at W. Marine.

Allow 7 (seven) days for 5200 to cure. 4200 or fast cure 5200 is not as strong.

GARY