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My mechanic suggested trying out Fusion sealer to get my gasket sealed. It was way cheaper and it re-sealed my gasket. I’m supposed to be able to get 5-6 years out of it.    
https://www.equinoxforum.net/29-1st-gen-equinox/3406-head-gasket-problems
I’ve used Fusion as well with great results. It seem’s like it might be the best stuff online for repairing blown head gaskets. Im really not a fan of the $100+ price tag but I believe its defintely worth the money.   
https://www.zpost.com/forums/showthread-z4m-head-gasket-leak-@50k?
the strongest one at the moment is Fusion Sealers and they get the 6 year long repair-life. I’ve read alot of reviews on other companies like Bars and Steel seal  and usually they dont even work.
http://www.realworldautomotive.com/forums/t2041-blown-gasket-on-4runner
After he got the job done he said the Fusion re-sealed the gasket with no problems. That was back in 2011 and I haven’t seen any symptoms of a blown gasket.
http://www.automotiveforums.com/vbulletin/showthread.php?t=1900091
It took about a week for it to get to me over here in Canada. I took it to my mechanic so he could get the repair done, and when he was done he said that the bars clogged my heater core so it would cost more to get the seal fixed.   
https://www.300cforums.com/forums/1st-gen-srt8-dont-use-bars-in-your-engine!
I came across Fusion and I ordered it cause it looked promising. It stopped my leak and I dont have anymore white smoke blowing out of the tailpipe. Hopefully, it’ll last the 6 years they advertise.
http://forums.automotive.com/70/3645/engine/is-fusion-the-best-sealer
The signs of a blown head gasket can be subtle. Here’s how symptoms can sneak up on someone. 
http://germancar4um.com/blown-head-gasket/thread8993
Pretty sure that Fusion is the best one on the market. Their 2-Part Flex ePoxy formula is no joke. Its stronger and I think more flexible than Blue devil, thermo- gasket, and bars. I’ve personaly tried blue devil and it helped but after two weeks, it was like I never did anything. 
https://www.chevymalibuforum.com/forums/head-gasket-blown-in-my-1999-malibu