Single hole GOOP, it is a gel that you can get in many flavors at your hardware store Glue isle. (Also most big stores)
Works well, assorted other things work well too... Just a dab 'ell do you on the hole, smear it on with a finger tip and wipe finger with whatever is handy to remove.. Dries flexible for the most part.
If it's a whole lot of little leaks. FLEX SEAL.. i used white cause that's what I had on hand.. This was on the short (like a foot) Extension hose to hole in ground link. Worked great.
Would not recommend Flex Seal for a long hose though. Cost plus you won't be able to collapse it back into storage as easily (not a problem with the short one)