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!
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.
So I called tech support and they explained that fuel tank sealant is used only to keep carbon monoxide out of the cabin. This sorta makes sense to me as only the flanges are sealed and not every rivet if we were really concerned about fire.
Unfortunately, my understanding is that those building as E-LSA don't have a choice. We have to build per the instructions.