@Lexi my son's taken a bath with them more then a handful of times and I didn't know about the glue truck until I got a new bath you from my mother. So I don't know if doing it now to the older toys will help
Yeah I would toss and get new ones for sure I’ve thrown out alllll toys that have holes because they get mold so fast
Do the opposite and cut a bigger hole in them and dry them on radiator after the bath to make sure theyre fully dry, then gluegun any new ones you buy in future xx
If your gonna fill the holes do it before you use them