Firewall sealant

[hamblin10]

I'm getting ready to start section 22 and see the KIA instruct to use fuel tank sealant for the firewall. Should this not be firewall sealant such as Flamemaster CS-1900 sold in the vans store? Thanks!

[N8DAV8R]

Originally Posted by hamblin10

I'm getting ready to start section 22 and see the KIA instruct to use fuel tank sealant for the firewall. Should this not be firewall sealant such as Flamemaster CS-1900 sold in the vans store? Thanks!

As far as I know, that is the correct interpretation. That sealant is used generically as an adhesive/sealant in a number of places throughout the build.

FYI, 3M makes a fire proof sealant that comes in a tube for a caulking gun that would be quite a bit more convenient for these type of small applications.

[wirejock]

This stuff.
3M™ Fire Barrier Silicone Sealant 2000+
By the way, if you take a piece of packing tape and wrap the tip, it seals really well. Next use just peel off the tape and squeeze over a trash can. If there's a plug set up, it comes right out.

[rocketman1988]

…and the Fire Barrier 2000+ is NOT the same that they sell at most big box stores, labeled with Fire Barrier CP.

Make sure you get the 2000+ type.

[N8DAV8R]

https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

[DanH]

Don't use a polysulfide sealant (aka proseal) in a firewall.

The FireBarrier 2000+ tests well.

I recently ran some tests with "real" firewall sealants. They generally fall into two classes, rubber based and silicone based. The recent market entries all seem to be silicones. Current favorite is Dapco 2100, as it is single part, no mixing, thus easy to dispense with little waste. Performance appeared to be on par with the two-part choices.

As Bob said, the home store 3M sealant is a latex base. Nope.

[iwannarv]

There is also a FireBarrier 1000NS availalbe from 3M. Looking at the specs between it and FireBarrier 2000, I'm having a hard time determining what the primary difference is between the two. 1000NS is about 1/2 the price.

[sc_pilot]

Originally Posted by DanH

Don't use a polysulfide sealant (aka proseal) in a firewall.

The FireBarrier 2000+ tests well.

I recently ran some tests with "real" firewall sealants. They generally fall into two classes, rubber based and silicone based. The recent market entries all seem to be silicones. Current favorite is Dapco 2100, as it is single part, no mixing, thus easy to dispense with little waste. Performance appeared to be on par with the two-part choices.

As Bob said, the home store 3M sealant is a latex base. Nope.

I’m curious why you say not to use Polysulfide on the firewall? I bought Flamemaster CS3204 tank sealant for my firewall as the plans said to “apply tank sealant to all seams and rivet heads on the firewall”. Is there a great concern of using polysulfide and should I now scrape off a hundred rivet heads? I’m not trying to argue, just curious cause the plans didn’t say to avoid using a particular type of sealant.

[Mich48041]

Fuel tank sealant is flammable and smokes while burning.

[rv9builder]

Originally Posted by sc_pilot

I’m curious why you say not to use Polysulfide on the firewall? I bought Flamemaster CS3204 tank sealant for my firewall as the plans said to “apply tank sealant to all seams and rivet heads on the firewall”. Is there a great concern of using polysulfide and should I now scrape off a hundred rivet heads? I’m not trying to argue, just curious cause the plans didn’t say to avoid using a particular type of sealant.

I've wondered about this too. Has anybody asked Van's tech support? For those of us building E-LSA, I think we're supposed to use whatever is specified in the plans.