easier to mix if a drill attachment is used. very good product.

John C Verified Purchase

Flamemaster Chemseal 2.5 Oz CS3204 B2

A little more in price than canned Parts A/B, but makes mixing a LOT easier.

Earl J Verified Purchase

Flamemaster Chemseal 2.5 Oz CS3204 B2

Easy mixing.

Earl J Verified Purchase

Flamemaster Chemseal 2.5 Oz CS3204 B2

good product

Karl R Verified Purchase

Flamemaster Chemseal Pint CS3204 B2

Worked great

Seth Verified Purchase

Flamemaster Chemseal 6 Oz CS3204 B2

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

Very good product. I always buy the Chemseal. Budget friendly too.

Aero T Verified Purchase

Flamemaster Chemseal 6 Oz CS3204 B2

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

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.

Product was as good as we used at Bombardier aerospace

Richard C Verified Purchase

Flamemaster Chemseal 6 Oz CS3204 B2

Product is as good as we use at Bombardier aerospace

Richard C Verified Purchase

Flamemaster Chemseal 6 Oz CS3204 B2

awesome stuff

Rich P Verified Purchase

Flamemaster Chemseal 6 Oz CS3204 B2

Dang, this stuff is easy to use,,, and works well in any caulk gun.

The tubes make sealing large areas a lot faster. Not having done many tanks, I can lay a bead, smooth it out and assemble the parts much faster using the tubes than batch mixes.

Marty T Verified Purchase

Flamemaster Chemseal 6 Oz CS3204 B2

It still has that pleasant odor and smooth, creamy taste. just kidding! If you have a large job to do, get the tube. It works great for sealing stringers and ribs because you can apply and spread it out quicker. When the pot life clock is running, its best to have a way to do things quicker.

Marty T Verified Purchase

Flamemaster Chemseal 6 Oz CS3204 B2

Did the trick, seals as described, nozzle included

Jeffrey F Verified Purchase

Flamemaster Chemseal 6 Oz CS3204 B2

We used 8802 at Lockheed for structural assembly and I was looking for some for building race cars and this is it. It is just as smelly, goooyie, messy, and strong as 8802. Industrial grade.

Neil C Verified Purchase

Flamemaster Chemseal Pint CS3204 B2

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

Product arrived quickly , easy to use, my new go to for all tank repairs

Anthony W Verified Purchase

Flamemaster Chemseal 6 Oz CS3204 B2

good date, dont have to use it for a few months

Joseph G Verified Purchase

Flamemaster Chemseal 2.5 Oz CS3204 B2

Excellent stuff!

Mike C Verified Purchase

Flamemaster Chemseal 6 Oz CS3204 B2

Worked just as it should have. Sealed the leak from a crack in a fuel tank for a 1964 172.

Richard P Verified Purchase

Flamemaster Chemseal 6 Oz CS3204 B2

Excellent product

Steven P Verified Purchase

Flamemaster Chemseal 2.5 Oz CS3204 B2

This product meets MIL-S-8802 which is species by Piper and Vans to seal or repair fuel tanks. Beware it is a bit messy to use and working times are short so mix small batches. tape over any area that you do not want to get the sealant on such as wings or tank surfaces that do not need to be sealed. Cleans up easily with MEK. As good as Proseal but less expensive.

Bill W Verified Purchase

Flamemaster Chemseal Pint CS3204 B2

Worked great. Thanks!

Steve C Verified Purchase

Flamemaster Chemseal 2.5 Oz CS3204 B2

Worked as advertised. Used with Semco gun. No problems!

Calvin D Verified Purchase

Flamemaster Chemseal 6 Oz CS3204 B2

Does the job. Great sealant.

Top F Verified Purchase

Flamemaster Chemseal 6 Oz CS3204 B2

Great product! Perfect for resealing Mooney tanks. Good value

Carl A Verified Purchase

Flamemaster Chemseal Pint CS3204 B2

Product sealed fuel leak. Efficient delivery on order.

Serge B Verified Purchase

Flamemaster Chemseal Pint CS3204 B2

excellent product. very quick shipping time.

Gregory T Verified Purchase

Flamemaster Chemseal 6 Oz CS3204 B2

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

had to throw it in the trash because the container malfunctioned

Darwin T Verified Purchase

Flamemaster Chemseal 6 Oz CS3204 B2

I ordered 3.5 oz tube which was WAY more than needed to seal approximately 6 linear feet of fuel tank on a RV6A. Smallest quantity would have been fine.

Dale K Verified Purchase

Flamemaster Chemseal 6 Oz CS3204 B2

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

Great service and great product!

Steve B Verified Purchase

Flamemaster Chemseal Pint CS3204 B2

Sealed my chem, thanks.

Mark T Verified Purchase

Flamemaster Chemseal 6 Oz CS3204 B2

My kit came with a nozzle, just FYI for future customers

This is the perfect size for small repairs.

Paul A Verified Purchase

Flamemaster Chemseal 2.5 Oz CS3204 B2

Really excellent! Take your time to properly mix it up and youre good to go!

Jerry O Verified Purchase

Flamemaster Chemseal 6 Oz CS3204 B2

Hard to mix thoroughly but it does the job

Tony F Verified Purchase

Flamemaster Chemseal 6 Oz CS3204 B2

The tubes of sealant were quickly delivered and the product worked as advertised. Well worth the price versus replacing the fuel tank.

Gary V Verified Purchase

Flamemaster Chemseal 6 Oz CS3204 B2

I have been using this product on the last 2 experimental aircraft build, love this stuff, great bonding strength

Maurice C Verified Purchase

Flamemaster Chemseal 6 Oz CS3204 B2

It sticks like s--t to a wool blanket!!!

Cobb A Verified Purchase

Flamemaster Chemseal 6 Oz CS3204 B2

Great Product

Natron A Verified Purchase

Flamemaster Chemseal 2.5 Oz CS3204 B2

Online vids help with instructions. Mixed it longer than minimum to be sure of thorough mix. Cure time doubled in cold hangar, as expected. Kept a sample to monitor cure status.

Ashcraft A Verified Purchase

Flamemaster Chemseal 6 Oz CS3204 B2

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

B2 is a little slow to cure in cool wearing but the longer working life really lowers the stress level if you have a lot of fasteners or rivets to get in before it sets up.

Wayne ( Verified Purchase

Flamemaster Chemseal 6 Oz CS3204 B2

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

Good service

Duane D Verified Purchase

Flamemaster Chemseal 2.5 Oz CS3204 B2

Easy to mix and use. Follow directions on package. A Little stiff on application for smoothing with a paint brush. Very good!

Steven J Verified Purchase

Flamemaster Chemseal 6 Oz CS3204 B2

Great stuff! I see it in my airline career and on my 172. This was for my sons boat but hey it seals aluminum and sticks.

Phillip P Verified Purchase

Flamemaster Chemseal 6 Oz CS3204 B2

Excellent product! I would order again!

Daryl A Verified Purchase

Flamemaster Chemseal 2.5 Oz CS3204 B2

I bought two tubes. One worked properly the other one did not cure out. There was not enough hardener, in the mix, for it to set up properly.

Curtis I Verified Purchase

Flamemaster Chemseal 6 Oz CS3204 B2

I used this product to seal a leak between the aluminum fuel tank and mounting straps on my Freightliner semi truck. It has only been a week but there is no leaks and I believe this fix will last forever. Definitely cheaper than $2500 for a new tank. Ordering another pint for the other side.

Robert S Verified Purchase

Flamemaster Chemseal Pint CS3204 B2

The best sealant

Darrin B Verified Purchase

Flamemaster Chemseal 2.5 Oz CS3204 B2

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.

Worked great.. less mess.. easy to mix.. works in normal caulk gun as well! BONUS!

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

Fast Delivery, shame the freight is so expensive.

Perfect for sealing our fuel tank fuel level float and attached fittings. Long work life as advertised

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.

Great product, works as described

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.

Works well as expected.

Had a leak in an integral aluminum fuel tank that hadnt been sealed properly since built. Worked superbly.

Used sealant to repair obsolete 30 year old plastic fuel tank

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.

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.

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...

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.

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)

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.

...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.

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.

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.

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.

Product works fine I used a calk gun,

Gary W Verified Purchase

Flamemaster Chemseal 6 Oz CS3204 B2

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

seems to be a good product. cure time is much longer in cool temperature. pint can was only half full, but adequate for my job.

Rick B Verified Purchase

Flamemaster Chemseal Pint CS3204 B2

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.

This product shipped by regular mail (USPS) and took to long to get.

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