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  #11  
Old 01-20-2018, 07:32 AM
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DanH DanH is offline
 
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Quote:
Originally Posted by snopercod View Post
You have to be careful choosing a fire barrier caulk. On my Lancair I used the stuff that came with my Firewall 2000 Ceramic Blanket kit - 3M, I think. Over the years, it ate into my engine mounts.
John, can you identify the sealant?
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  #12  
Old 01-20-2018, 03:10 PM
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Originally Posted by DanH View Post
John, can you identify the sealant?
I'm afraid not. I threw the tube out over twenty years ago. Here's what it did to my engine mount, though:



I wire brushed it down to bare metal, determined that the damage was superficial only, primed it with red oxide primer, and top coated it.
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  #13  
Old 01-21-2018, 07:02 AM
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Hmmm. I suspect latex sealant, or one of the acid cure silicones, but I'll have my cowl off today for a condition inspection in progress. I'll take a hard look at the FireBarrier 2000, now going on 9 years since installation, in a humid deep south climate.
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  #14  
Old 01-21-2018, 08:04 AM
Bavafa Bavafa is offline
 
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Quote:
Originally Posted by DanH View Post
Hmmm. I suspect latex sealant, or one of the acid cure silicones, but I'll have my cowl off today for a condition inspection in progress. I'll take a hard look at the FireBarrier 2000, now going on 9 years since installation, in a humid deep south climate.
Hi Dan,
Please report back if you see any sign of issues, I just used the same Fire Barrier 2000 to seal/adhere fiberfrax/stainless steel sheet to my firewall. It will not touch the engine mount but still would like to know if it has any corrosive affect on metal.
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  #15  
Old 01-21-2018, 01:35 PM
tgmillso tgmillso is offline
 
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Hey Meherad,
My heart skipped a beat when I too read these last few posts. I checked the specs on Fire Barrier 2000+ and it is indeed a neutral curing silicone, so non corrosive. Specs, and statement that it is "neutral-cure" may be found below:
https://www.3m.com/3M/en_US/company-...3123941&rt=rud

The only negatives I could find with respect to corrosion were during the curing process. In one of the data sheets available the following statement is made:
"Note: In confined cure conditions, there may be discoloration of brass, copper or other sensitive metals."
http://multimedia.3m.com/mws/media/1...alant-2000.pdf

Apart from that the only other corrosion info on the product I could find was an old thread DanH contributed to on VAF:
http://www.vansairforce.com/communit...t=35016&page=2

Hope this helps you sleep better.

Tom.
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  #16  
Old 01-21-2018, 09:22 PM
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Previously I said

Quote:
Hmmm. I suspect latex sealant, or one of the acid cure silicones, but I'll have my cowl off today for a condition inspection in progress. I'll take a hard look at the FireBarrier 2000, now going on 9 years since installation, in a humid deep south climate.
Not the slightest sign of corrosion on anything. Maybe in another 9 years.
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  #17  
Old 01-22-2018, 08:41 AM
Bavafa Bavafa is offline
 
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Thank you Tom and Dan for confirming this.
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