Can you post a picture? There are videos that outline and detail patching a hole like that.
I have done much bigger ones that have held for years.
2011 351RLTS Eagle, Mor/Ryde suspension & pin box, PT50C EMS
06 F350 Lariat PSD, SRW, LB, CC, EGR delete kit, 16K DrawTite hitch, Timbrens, TST TPMS
2017 GMC Terrain (future TOAD)
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