Flamemaster is great for structural gluing and sealing outside of a fuel tank. It easy to mix and dispense.
Todd A
Verified Purchase
Flamemaster Chemseal 2.5 Oz CS3204 B2
September 4, 2024
Terrific sealant. Mixed easily per the instructions and remained workable throughout the 1 hour it took to apply. took the full 72 hours to completely cure. It is very viscous while working with it, and it sticks to everything...so prepare carefully to do a neat job.
Al A
Verified Purchase
Flamemaster Chemseal 2.5 Oz CS3204 B2
June 13, 2024
I got the Kit 1, with 2.5oz of B2 sealant, labeled NSL brand. While I was dreading the project of fixing my fuel leak, this stuff is actually not bad to work with. It doesnt have a strong smell, and the mess is very manageable if you leave the back cap on and use the included applicator tip. Any excess sealant on the aircraft can easily be wiped away with acetone prior to full cure after that, use Poly Gone. Theres no need for a caulking gun or the sealant mixer tool that goes on a power drill. When freshly mixed, you can squeeze this out with just thumb pressure on the back. When you cant reach any further, push with a deep socket. Throughout the 2hr application time, the sealant will get harder, so if you think youll need that full time, squeeze it out into a paper cup and use popsicle sticks instead.
Kenneth J
November 17, 2023
Dang, this stuff is easy to use,,, and works well in any caulk gun.
Rich P
October 12, 2023
works fine. if you dont have the applicator gun it can be difficult to squeeze out
Stephen T
Verified Purchase
Flamemaster Chemseal 2.5 Oz CS3204 B2
June 1, 2023
good date, dont have to use it for a few months
Joseph G
Verified Purchase
Flamemaster Chemseal 2.5 Oz CS3204 B2
May 1, 2023
Excellent product
Steven P
Verified Purchase
Flamemaster Chemseal 2.5 Oz CS3204 B2
March 2, 2023
Worked great. Thanks!
Steve C
Verified Purchase
Flamemaster Chemseal 2.5 Oz CS3204 B2
February 16, 2023
Martin A
Verified Purchase
Flamemaster Chemseal 2.5 Oz CS3204 B2
December 6, 2022
This sealant works well. Set time is predictable and 48-72 hours cure is accurate.
Would recommend
Steve C
Verified Purchase
Flamemaster Chemseal 2.5 Oz CS3204 B2
November 4, 2022
Application is a little tricky as it sticks to everything as soon as you touch it. Recommended to apply with someone else help as you can move on quicker. Working time is around 2 hr but it gets harder as you get closer to the 2 hrs margin. Make sure to have lots of wood sticks to spread out and lots of disposable gloves. Overall quality very high, yet to test for durability but we have high expectations.
Benjamin G
Verified Purchase
Flamemaster Chemseal 2.5 Oz CS3204 B2
August 16, 2022
My kit came with a nozzle, just FYI for future customers
Thomas F
April 19, 2022
This is the perfect size for small repairs.
Paul A
Verified Purchase
Flamemaster Chemseal 2.5 Oz CS3204 B2
March 5, 2022
Great Product
Natron A
Verified Purchase
Flamemaster Chemseal 2.5 Oz CS3204 B2
January 11, 2022
Worked great! By mistake I ordered B2 instead of B1/2 and was glad I did. The extra cure time was a delay but I was happy I had the extra work time. The only thing that wasn’t slow was Spruce😎
James D
Verified Purchase
Flamemaster Chemseal 2.5 Oz CS3204 B2
December 21, 2021
Perfect amount for a small job. 2 hr work life assures time to do the job neatly.
David L
Verified Purchase
Flamemaster Chemseal 2.5 Oz CS3204 B2
October 5, 2021
Glenn J
Verified Purchase
Flamemaster Chemseal 2.5 Oz CS3204 B2
September 14, 2021
Good service
Duane D
Verified Purchase
Flamemaster Chemseal 2.5 Oz CS3204 B2
August 4, 2021
Excellent product! I would order again!
Daryl A
Verified Purchase
Flamemaster Chemseal 2.5 Oz CS3204 B2
July 2, 2021
The best sealant
Darrin B
Verified Purchase
Flamemaster Chemseal 2.5 Oz CS3204 B2
June 2, 2021
Nick C
Verified Purchase
Flamemaster Chemseal 2.5 Oz CS3204 B2
May 27, 2021
This is the perfect size for a tank leak repair. The mixing is almost automatic so you get a reliable cure. Ships fast and is worth the price.
Nicholas M
May 12, 2021
Worked great.. less mess.. easy to mix.. works in normal caulk gun as well! BONUS!
Ap
February 10, 2021
Highly recommend this product for sealing exterior pin holes on fuel bladders. Material can be applied on vertical surfaces and does not run or sag. Comfortable working time on previously prepared surfaces. Product has excellent surface bonding characteristics. Product appears to be resistant to ethanol blended fuels. Advise doubling recommended curing times
Alan Z
September 16, 2020
Fast Delivery, shame the freight is so expensive.
Geoff S
August 14, 2020
Perfect for sealing our fuel tank fuel level float and attached fittings. Long work life as advertised
David L
July 7, 2020
Easy to mix without the use of special tools. I pushed the product out of the tube using a socket and extension as a pushrod. The Class B2 has a working time of 2 hours and a cure time (at 77 deg F and 50% RH) of 72 hours. Product worked as expected and seems to retain a little flexibility.
Leo K
May 20, 2020
Great product, works as described
Bens M
January 30, 2020
Convenient size for small jobs. Getting it between 70F and 80F before mixing makes the mixing very easy. The product can be pushed out with a thumb and does not require anything other than the packaging to mix and apply.
William W
January 25, 2020
Works well as expected.
John R
January 16, 2020
Had a leak in an integral aluminum fuel tank that hadnt been sealed properly since built. Worked superbly.
Norm
November 24, 2018
Used sealant to repair obsolete 30 year old plastic fuel tank
Neil C
September 14, 2018
I really like this product. I use it at work on aircraft, and purchased it here to use at home on my airstream trailer renovation.
Joe S
April 6, 2018
Worked as advertised.
Used the mixing tool in my drill and mixing was easy and fast.
So far fuel tank is sealed up tight and nothing leaking.
Hope it lasts for many years to come.
Terry B
March 16, 2018
Addition... Mixing: I clamped a slow speed drill (pointing up)in my vise and chucked a hole saw (backwards) that had holes that (nearly) matched the plunger handle of the tube. A couple of #8 screws, and I now had a power mixer. Turn on the drill (CW) and move the tube full stroke up and down 50 times (overkill) or so. Dispensing: Like a previous reviewer, I just used a cheap $5 gun.. mine didnt even require making the plunger diameter smaller.. it fit perfectly...
James S
March 16, 2017
Used this (B-2)for sealing the fuel sending unit into the side of a wing tank. All is well. I would probably use the faster version next time (B-1/2). Cures very flexible, not as hard as Proseal, but it is a polysulfide product (like Proseal) so we will see how long it lasts.
James S
March 16, 2017
Although I waste more than I probably should, I never have any issues with these kits not curing properly. I bought a cheap caulking gun and ground the ram down a bit on my bench grinder so that it fits the plunger on these tubes. Presto! $5 proseal gun! (use a zip tie to make sure the tube stays anchored in the cheap big-box store caulking gun)
Dana R
January 24, 2017
This sealant works awesome. It cures to a hard rubber and really seals. After trying a different sealant and it not working, I was desperate to find something to seal up my fuel tank. This stuff fit the bill and is completely leak free.
Chet R
June 3, 2015
...make sure the metal is bare and clean, i had a wing tank neck/nipple that i had to have a welder extended higher to work with my newly built wing tanks, after welding he gave a shot of spray paint on where he buffed the metal. After i threaded the nipple/neck into the top of the wing tank, I smeared the sealant on the inside of the nipple at the junction of the threads in addition to putting sealant on the fine threads. The sealant i had on the smooth part of the inside of the nipple started to lift because of the spray paint the welder put on after welding.
Ken K
June 18, 2014
The brand I used says Flamemaster on the tube, which comes in a plastic bag. On the bag it says NSL Aerospace and shows a website www.nslaerospace.com the fuel fittings I used it on and even on my rubber dust cover where my wing tank fuel neck comes up through have all held out Excellent since I put it on last summer, and is still nice and flexible around my fuel neck nipple. I also used some to seal a rubber grommet on top of my white plastic football fuel tanks on my Ultralight and thats still Excellent.
Ken
May 16, 2014
I used it again with Excellent results, this time I was more aggressive with the mixing giving it more than the recomended min 50 strokes and like it says on the packaging extra mixing may initiate curing of sealant inside the cartridge...which it did, as I noticed it got hard to push it out of the cartridge ( I was just using my thumbs to push it out of the cartridge as I don't have the cartridge gun or know where they sell it ??) but I still had plenty of time to get what I needed out of the cartridge for my job on my new fuel tank...it works no leaks on the NTP threads !! Its too bad they don't make smaller tubes to eliminate waste, because once its mixed you must use it, as the stuff left inside the cartridge sets up to a rubber like solid compound within hrs or overnight.
Ken K
September 21, 2013
You must not have mixed it properly I used it twice and it cured within 4 hrs to where I was forced to open a new tube cause it cured enough that when I need more it was set up in the tube after 4 hrs in hot weather.
Ken K
September 13, 2013
Worked great. Just the right size, so no waste. The mixing before it was squeezed out of the tube is the best idea yet. I have only used the pint cans and bigger, and never was able to use a drill to mix it with. I did rate 4 stars because the directions were vague and hard to see. I did find ta YouTube video that showed the mixing and using. I will buy this again.
Joseph H
Verified Purchase
Flamemaster Chemseal 2.5 Oz CS3204 B2
July 22, 2024
I received two brands. One is Flame Master Chem Seal CS3204 from National Sealants & Lubricants and is excellent even after one year of storage it cures in one day at 28°C cures to a hard flexible rubber shining surface. The other brand was A-C-Tech AC-226 B4 from Advance Chemistry & Technology , and it didn't cure after 14 days just became less sticky.
Richardo
January 3, 2014
This product shipped by regular mail (USPS) and took to long to get.
Larry H
January 26, 2021
1st disappointment was Aircraft Spruce not mentioning or listing the required caulking gun for applying the sealant. Instructions a little confusing on how to mix. Hopefully it seals.
Adam A
Verified Purchase
Flamemaster Chemseal 2.5 Oz CS3204 B2
October 31, 2022