K-Seal ST5501 Multi Purpose One Step Pour and Go Coolant Leak Repair 8 fl oz Bottle

I used K-seal. I did some research on which one to use beforehand and that’s the one I landed on in my research. Worked well for me. Just know it’s always a roll of the dice. Edit: it was this exact one https://www.walmart.com/ip/30391261?sid=2b9df175-05aa-435b-a084-72f629d84b63