It is a cheap tent with a woven PE groundsheet (I would have been really irritated if they had damaged my MSR Super Fusion), but I would like to get it back into use for family camping trips. The challenge I am facing is that I am struggling to find a solution to repair the cut in the groundsheet. - It appears that almost nothing will actually stick to a PE groundsheet.

I have seen some tarp repair tapes on sale on eBay, but I am wondering whether they will actually work.
Does anyone have any suggestions on a good method of repair?