Do 'head gasket repair potions' like ThermaGasket work?
Note: This page has been modifying by Woopsgoops, RxAuto,
Jrangel78 since 15 Mar 2008 to today. Some important answers has
been deleted. I am restoring it. These guys are probably related
with RXAuto, the producer of Thermagasket
I didn't use Thermagasket but I talk with Kirk Malley, the owner
of the company, twice. The first time I talked with him, he pushed
me to buy the product saying it is money back guarantee (except
taxes and shipment cost). I made some tests on my car myself to
assess the problem and I have been trying to find out more using
some forum on the Internet. My car is a 4 cylinders Toyota and it
likely has 3 of cylinders that produce immediately exhausted gas
in the cooling system. In the second call, Kirk was trying to
say that people didn't know what was going on. He has always be
nice even if he was selling his product. After I carefully
explained him the tests I did and the result he politely told me "I
cannot help you I am sorry". This is my story. I am pretty sure
that Thermagasket can fix some problems and it is not a scam. If
other products, less expensive could also fix the problem in the
car longer I don't know. $100 for a problem that usually takes more
than $1000 to fix (unless you do yourself) could be a good
The head gasket seals oil ports, cooling ports and the cylinder
compression chambers where the head is mounted onto the engine
block. Problems with blown head gasket include oil loss, coolant
loss and engine power loss due to lost cylinder compression.
This can result in a variety of problems:
1) COOLANT IN THE OIL evidenced by a "milkshake" white frothy
looking goo under the head gasket (look under the oil fill cap (and
under the valve cover through the oil fill port with a flashlight).
sometimes you'll see water or coolant on the dipstick.
2) OIL IN THE COOLANT evidenced by the coolant turning brown
with a slight oil slick look on the water surface (if there's any
3) Leaky radiator or other part of the cooling system; if one or
both of the first two indications are present, then it is likely
that the cylinder pressure is bleeding into the cooling loop. if
this happens then the pressure buildup will cause the weakest point
4) CRACKED or WARPED HEADS. The problem that caused the head
gasket to fail may have caused the heads to either warp or crack.
In this case, there will be more expense than just replacing the
5) BLOWN GASKET BETWEEN CYLINDERS OR TO ATMOSPHERE. Here, the
head gasket is blown and the only evidence of failure is loss of
I owe a Chrysteler Leberon 1992, the car had some issues
regarding the heating of the engine from past 4-5 months, I
replaced the thermostat then I also checked the cooling pump. My
mechanic had actually removed the thermostat from its system since
it was still overheating. The car worked good for about 2-3 months
but then all of sudden it was again overheating. Mechanic told me
that there is some problem with the radiator of the car, so I
replaced the radiator, along with flushing the cooling system.
which costs me around $350 in all. And now the thing started from
here on, after flushing, they found that the car's head gasket is
gone, there is coolant in the engine oil, which turned it milky in
color and there are smoke clouds coming out from the tail pipe. The
mechanic told me that its better for me to sell it now. But selling
a 1992 leberon in this condition would me not more than $100-200
only!! which I bought for $1500 a year ago. I of course have no
money to spend on it, because repairing the head gasket could be of
at least $600 or more. So, I had decided to try the
Thermagasket on my car. I got to know that they have that
money back guarantee also. So I ordered it for my car.
After getting it, I got to know that the money back guarantee
which they offer is only in case that the car is either scrapped or
donated to someone or the work order is placed for the car in an
authorized service station of repair of the head gaskets which will
at least be of $1200 or more, so i was really worried about it.
Anyways then, I had started following all the instructions given
in the paper which came along with the Thermagasket because
that was the only way for me now. I was running the car at 2000 to
3000 rpm on the final stage of the repair and all of a sudden the
smoke which was coming out from my tail pipe started beginning to
reduce a bit, then after 5-8 min the car noise also changed to
normal and finally the smoke is all gone!! I was really surprised
to see something like that. My car was working normally, I am still
following the aftercare given in the instructions and the car is
working normally till now, It's almost 2 weeks now, I really don't
know that how long it is going to last, but at present it is
working for me. I am pretty much satisfied with the product, for
which I was really not sure in the start. What I think is, if you
are in a position to scrap your car, or if you are really not in a
situation to spend $600-1000 Thermagasket is worth a try,
but still don't trust on the money back guarantee, take it like you
are taking a risk of $150 or so.
Malley of RxAuto Thermagasket: The way the
guarantee works is if your having any issues with the
Thermagasket treatment process, not working you must First
contact technical support and give us the chance to help get the
vehicle repaired. If we cannot help get the vehicle repaired, or
the repair fails the tech support rep will issue a refund
The money back guarantee does work as long as you work with the
technical support (Robert) and all resources have been exhausted.
This product worked for me in my 2000 BMW 528i (2yrs ago) and
re-introduce it again on June 18, 2008 because of a water pump and
auxillary fan failure. Drove car for 30 miles (60 miles roundtrip)
at 80 MPH no overheating or compression buildup in cooling system.
Save me lots of money and time by using the Thermagasket
It all depends on the damage of the gasket I have used
Thermagasket with no change at all same leak
I just used CRC Copper Block Weld in my 88 Ford Bronco
II. I was losing almost 1 gallon of coolant/day, and my oil had
water in it. I couldn't afford a head gasket, so I tried the CRC
stuff. I followed the instructions on the bottle to the letter, and
now my oil is normal, I'm not losing a drop of coolant, and the
engine runs great!
I didn't know CRC had a product for this (I haven't blown a head
gasket in a vehicle since somewhere around 1966.) Because of the
suggestion here, I researched then tried the (CRC) "K&W
Permanent Metallic Block Seal" and it failed miserably, despite
following the instructions explicitly - it made no difference
BUT (sound of horns blowing and banners flapping), when I
e-mailed CRC and described what had happened, they immediately
offered to replace the product - directly to me. I have no
connection or affiliation with CRC in any way (other than as a
consumer) but I've got to say, that to date - every product of
theirs that I've used (more products over more years than I care to
try to list), I've been, at very least, completely and absolutely
satisfied with. In most instances, I've been incredibly surprised
with the favorable results. It seems as though the can I got was
"very old stock" which isn't too surprising seeing as I bought it
through my local jobber who's 80 mi. from Toronto and their supply
depot is another 40 mi. further from the city (once again, don't
get me wrong. my jobber's prices are great, they've got complete
machine services that can't be beat and their support is amazing?
They just don't have a lot of demand for this type of product.) I'm
going to try it again & despite the failure, I've got another
engine I've already decided that I?m going to use it on too! I was
very relieved to find that their response to my difficulty was an
immediate offer to replace it, because I was very surprised to find
that it didn't work at all and that just doesn't fit with my past
experiences with CRC products.
I know this sounds like a commercial for CRC, and I'm sorry for
that - I'm just trying to relate that I've always had good
experiences with their products.
This leads me to another question though? Does anyone know of
any difference between "K&W Permanent Metallic Block
Seal" and RXauto's "Thermagasket"?
From everything I've been able to find, the only difference is
the price (RXauto's being about 5X.) I'm real interested in this
part too? It's nice to know when others come asking.
We have a 1996 Ford WindStar v6. It overheated really bad, we
had the radiator fixed, but it was still smoking really badly. We
tried 2 products from the auto parts store (not sure what they
were). One was a can one was a white bottle! Both repaired the
problem for about 2-3 weeks, before the smoke returned. My mechanic
said to try Thermagasket, that was the beginning of April,
and the car is still running great!
I used a product called DIKE for 18months, until I could
afford to get it fixed.
Its a plastic like product.
Add a small amount about a week apart until the leak stops.
Then, if it starts up again, add some more.
It is critical that you always know where the leak is and how
much is being leaked.
It will eventually, like the leak in a dam, get bigger until
Save up for the repair.
I used k&w block seal. it works great for head gasket
seals and block seals. make sure u follow the directions to the
I repaired my 1994 Saturn which had oil in the water (about a
quart) I used Thermagasket and it worked perfectly. They are
even around for support if you need them. I looked all over the web
for a discussion on this product to see if it worked for others,
but could not find one. I decided if i tried it i would post about
it regardless. Thermagasket worked great for me.
I have a 1994 Pontiac Grand Prix 3.1L V6 145,000 miles.
I HAD a head gasket issue until this weekend, when I used the
Thermagasket Product, I can't speak for the longevity of the
repair yet, but, my initial experience with it has been a positive
experience. As the previous writer stated, the people at
rxauto/Thermagasket answer questions, and have a no pressure
I had to do the quickie treatment because of freezing
temperatures in my area. I flushed the coolant system, changed the
oil and filter, and filled the coolant system with clean water as
directed. It took a little longer than the 15 minutes they stated
for the steam to subside, but after a 50/100 mile drive as
recommend in the directions, the problem seems to be gone.
I used K&W Block seal in a 1990 Dodge Omni
four-cylinder in 2004. It worked from February 11 to March 9 of
that year, then I had the head work done.
I am now facing a similar or worse situation with a '99 Olds
Cutlass, 6-cylinder (with two of everything). I just bought it,
with trading in my previous car, which had run great, (a '93 Buick
Skylark). I have put several cooling system parts on, on advice of
the lot or other mechanics--water pump, thermostat, radiator,
radiator cap, reservoir bottle, catalytic converter, 3 radiator
flush and fills, an oil change, had the transmission checked, and
three cooling system checks.
None of that had helped. I also had it checked by the shop that
had done work prior to my buying it. They'd apparently done an
intake gasket (the cheaper one), but it was still ok according to
the most recent radiator check.
All the checks point to the head gasket. I've tried two types of
Bars Leaks brand: liquid glass that you put into the system after
draining it, (one go-round with help from a mechanic), and the type
that pours straight into the top (two go-rounds myself, based on
website advice to repeat app. once if first didn't hold).
Didn't phase a thing.
Then I tried Bars Leaks Liquid Aluminum and Alum-a-=Seal
Now, I've been talking with Thermagasket people on phone.
They (he) seem(s) to be a trained mechanic with experience. I told
him my mechanic's own input, which was that those who've tried
sealants, even the elaborate kinds, haven't had any success. And
that the head is probably cracked, not just warped, and that there
is a simultaneous problem with the head gasket.
He answered pretty effectively. He also offered to speak with my
mechanic on the phone, and to walk us through a set of special
procedures he outlined.
I've seen similar procedures listed a Steel Seal's website, but
he said they have you do that, standard, whereas he is only having
me do them, to ensure the maximum benefit, and this would be with
my specific mechanic over the phone if needed.
So, I'm impressed thus far, though I haven't done it yet.
However, one thing, is, how long this will last. They all claim
they'll last forever. This is the thing.
Can you ever have peace of mind? And how ethical can you feel
about trading in the car later, even if the sealant has been hold
for quite some time?
IF I knew more about the "significant" difference between
Thermagasket and Steel Seal, say, or between Bars and
K&W, I could feel better about the later trade-in.
That is, if the seal did hold for a long time. Say, over a year.
Would that be a reasonably long time to think it was a permanent
Most people apparently don't have that much or that lengthy a
success with these, though. ?
What I've wondered about, is if there might be a related
specialty shop, that all they did, was replace head gaskets. You
know, not just a "full service garage" that does everything, but
one that specializes just in doing head gaskets.
If I were going to pick something that there might be a market
for, in this age of aluminum heads, that would be IT.
Because a shop like that, might be able to appreciably lower the
cost of having this particular little expensive job done, by a
couple hundred dollars. There's a sizable market now for this.
Does anyone know of such a place?
I also used K&W metallic permanent block seal.
The head gasket was blown one evening when I was driving home from
work, the water temp gauge went over the top and I had to pull over
to cool down the engine. It took me three hours to get home instead
of half an hour. First, I replaced the thermostat and thought that
it was the overheat problem, but later found out it wasn't the
problem. The coolant looked like a choclate milk and got lots of
white smoke coming out from the exhaust. I googled it and found out
it could be a blown head gasket therefore I checked the engine oil,
which it looked like a thick choclate milk shake. I took out one of
the spark plug and it was completely wet and soaked with the milk
shake. Looking into the spark plug hole, with my flash light, I
noticed there was a thin layer of water in the piston/combustion
chamber, and it looked worst than everything I could think of. So
the bottom line, coolant inside the engine and engine oil inside
the radiator. That was great! I thought the engine was done by then
until I heard about some kind of head gasket sealer such as
Thermagasket and K&W block sealer. I didn't want to wait
and need something fast, so Thermagasket wasn't my option
plus it's on the high side of the dollars. I decided to go to the
local auto part store and bought the K&W metallic block &
head gasket sealer. It cost me only $8 but I didn't think twice to
use it on my 93 Lexus GS300 with has 150k miles on it. I thought
about worst case I would have to donate the car. After two days of
the K&W seal treatment, from flushing the radiator 20 times, to
apply the seal and let it dry...the result was incredible! It fixed
the gasket problem and my engine runs like normal again, spark
plugs are dried, new coolant is flowing clean, no more white smoke
I used Thermagasket in my decade-old Plymouth Voyager,
which had 192,000 miles on the odometer and a mean oil leak from
the rear main seal. (In other words, I had nothing to lose!) The
2.4L motors in those vehicles are notorious for failed head
I followed the instructions exactly and it worked... for about a
year (6,500 miles). It had absolutely no negative impact on the
cooling system. However, its impact on the head gasket was
There is a reason the makers of Thermasgasket guarantee their
product for only 90 days.
If you want the vehicle to be reliable over the long haul, get a
real fix. One that doesn't come in bottles
Maybe for a short, SHORT period of time. Never use long term.
Have a new set of head gaskets put on before you crack a head or
A lot of people will tell you not to use these liquids and to
get a "real repair" from a mechanic if you want it to last. (I
wonder how many of these people are mechanics...) Well, I followed
their advice and spent $1000 on a head gasket repair. Two years
later, it's leaking again. So if you're worried about the liquids
not being a "permanent" repair, I'd say don't worry about it. The
real repairs aren't always permanent, either, and you can always
dump another can in. If the liquids only last 1 year, you could
make your engine last 100 years with the amount I spent on a
mechanic. I'm going to try one of the liquids this time, maybe the
new Head Gasket Fix by Bar's Leaks that doesn't require you to
flush the coolant first.
If headgaskets were permanent in themselves would we need to
YES IT WORKS... to an extent. My 2000 Caddy was
overheating a few years back and thermogasket fixed the problem for
about 15000 miles. I have to reuse thermogasket once a year or so
(and i drive 80 miles a day to work) to 'refix', but the product
does what it says.
SO FAR - SO GOOD! I have a 1991 Toyota previa with 214,000 miles
on it. I had all the classic symptoms of a blown head gasket -
white smoke in the morning, sometimes at an idle, disappearing
coolant, the heater didn't work, horrible smell of burnt coolant
inside the car that was making me sick. It was bad. So I went
online and found the product STEEL SEAL. I watched the video(which
was pretty convincing, the mechanics did not seem to me to be
actors at all). Well , I just put it in this morning (Tuesday,
December 15, 2009) , and I am (almost) beyond words. The
temperature gauge has returned to it's proper operating range and
the car is running great. I drove it for a couple of hours after it
took affect. I kept staring at the temperature gauge every ten
seconds. It didn't budge.
I have all the confidence in the world that it's going to hold
up but I'm positive that the majority of you guys are still
skeptical after only a few hours of service.
For that very reason I am going to give updates every day or so,
because, if this sh*t works - I want the whole world to know about
P.S. If someone sees this exact posting on another site it is
because I copied and pasted it. I don't want anyone to think that I
am some company lackey. As a matter of fact, here is my email if
you want to grill me further - firstname.lastname@example.org