LOL don't go that route! I used (many, many years back) leak sealers and they ended up clogging up my radiator. In one car I owned that had a nagging leak, I used a leak sealer and after about 6 months I had to rebuild the radiator because it clogged it up. Also, if it is a head gasket, you will probably need to get your heads machined. Hopefully it's not a head gasket, but the problem you are describing unfortunately sounds like that is what is most likely the issue

 

its head/gasket. Got my moneys worth out of the car. It’s either worth $1000 or 3-4K if the sealer works. It has 225k miles on It. Not worth a proper fix. Already have a new car but I’d drive it a good month before selling for a decent price to know it’s reliable before doing so. Best case to hope it’s a super small leak. Stop leak is not ideal but works in these kind of situations I’ve seen/had good results in the past

 

I see, I thought this was your daily driver. Yep, I would say you got your money's worth! Sounds like this would be a project car to me!