🛠️ Seal the deal, skip the shop—Green Demon fixes leaks like a pro!
Green Demon Head Gasket and Block Repair is a 16oz ceramic-reinforced sealant designed for permanent coolant leak repairs. Compatible with all engine types, it requires just one application poured into the radiator, curing within minutes to form a durable seal. Trusted by mechanics and DIYers alike, it prevents costly repairs by fixing head gasket failures, warped heads, and block leaks safely and efficiently.
| Manufacturer | GREEN DEMON |
| Brand | GREEN DEMON |
| Model | Green Demon Head Gasket and Block Repair |
| Item Weight | 1.57 pounds |
| Product Dimensions | 9 x 5 x 3 inches |
| Item model number | GD301 |
| Manufacturer Part Number | GD301 |
M**B
Leak sealed!
This stuff worked great. Top of engine cover leaking badly. Dumped the entire bottle in, ran the truck and 15 minutes leak was sealed up. Recommended!
G**E
Did not help.
Didn't help. Now my car holds 10 qts of top rated oil, pricey filter, overpriced thermostat, mechanic's pay + $69 Green Demon. Water-to-oil issue continues. There's no product to return. How am I supposed to receive refund of Amazon gift card credit when there's nothing to return? Product was poured into radiator.
A**N
I love it. Fixed my car and save me a lot of money!
Used on a 2006 Buick Lesabre 136k miles. I love the car but had a bunch of issues with the cooling system with bubbles in the overflow tank. The mechanic was quoting like $1900 to fix it, no way I could afford that. i looked around and decided to try Green Demon which checked all the boxes for me. I just wanted something easy to use that would fix the problem, plus they had extra tips for installation with high pressure. Thanks. Anyway, I followed the instructions, had to run the engine up a couple of times but then the bubbles stopped. That was a few days ago and everything is running fine. I'm blown away, saved a fortune and I still got my car on the road. Great stuff.
J**S
Easy!
Super and still holding!
A**R
Sealed cracked head on my kid’s 2012 Pontiac GT
Thank you Green Demon! The car was running badly with a misfire, dropping coolant liquid and white smoke coming out of the the tailpipe. My buddy found a crack in the head but not an easy (or cheap) fix so I purchased some Green Demon and just poured it straight in. WOWThe smoke stopped and then engine ran normal again. Just awesome. Cannot beleive how easy this was. Thank you so much guys!
C**.
Not worth the purchase price did not work.
Followed instructions to the letter, read all reviews, and the tweaks others found out about that worked. About blew up motor. So this was money thrown away can't return what no longer exists.
G**.
Don’t hesitate and buy it!!
This product is magic. It saved me a ton of money i thought i was going to have to junk the car but nope green demon to the rescue.
0**S
Not worth the money
If it works for some it didn't work for me at all, $50 dollars down the drain.
Trustpilot
1 day ago
2 weeks ago
