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  #1  
Old 04-29-2020, 06:58 AM
Kooshball Kooshball is offline
 
Join Date: Dec 2018
Location: NC
Posts: 163
Default Sealing carbon fiber plenum with RTV?

I after the annual is done on the -4, I am planning to improve the sealing of the carbon fiber plenum. We have one made of several pieces of overlapped, dull carbon fiber; not a shiny 1-piece plenum. The areas of overlap don?t have any gaskets; just carbon sheet on sheet and I planned to apply a bead of high temp RTV during reassembly to seal it up a bit.

Are there any reaction / interaction issues with silicone RTV being applied to dull carbon fiber sheets? I mention dull since the glossy, finish grade carbon sheets likely have a thick enough layer of epoxy where the carbon isn?t really in play for such a situation.

Thx
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  #2  
Old 04-29-2020, 07:46 AM
Southern Pete Southern Pete is offline
 
Join Date: Jul 2015
Location: England
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Using RTV will mean you will not be able to repair the baffling ever - the resin will not stick to a surface that has seen a silicone based product. Good quality duct tape might act as a thin gasket of you are worried about sealing. Doesn't matter if the carbon has a layer of epoxy giving it a shine, the silicone will penetrate and prevent anything bonding. If duct tape is too thin how about a strip of cork?
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  #3  
Old 04-29-2020, 08:15 AM
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SeanB SeanB is offline
 
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How about UHMW tape? Same as used on the flaps. Flyboy Accessories has the good stuff that does not "yellow".
https://www.flyboyaccessories.com/Pa...ilm-p/2301.htm
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  #4  
Old 04-29-2020, 12:37 PM
RVDan RVDan is offline
 
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I?d stay away from silicone for the reason mentioned. How about a thin foam tape? The foam would take up any gap up to the thickness of the tape.
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  #5  
Old 04-29-2020, 02:15 PM
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AX-O AX-O is offline
 
Join Date: Jun 2005
Location: SoCal
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Quote:
Originally Posted by Kooshball View Post
I after the annual is done on the -4, I am planning to improve the sealing of the carbon fiber plenum. We have one made of several pieces of overlapped, dull carbon fiber; not a shiny 1-piece plenum. The areas of overlap don?t have any gaskets; just carbon sheet on sheet and I planned to apply a bead of high temp RTV during reassembly to seal it up a bit.

Are there any reaction / interaction issues with silicone RTV being applied to dull carbon fiber sheets? I mention dull since the glossy, finish grade carbon sheets likely have a thick enough layer of epoxy where the carbon isn?t really in play for such a situation.

Thx
I have been using this between my carbon fiber plenum and the aluminum baffles. so far it is working well.

https://www.mcmaster.com/85925K205
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  #6  
Old 04-29-2020, 02:46 PM
Gusmax Gusmax is offline
 
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Location: Sherwood Park, Alberta
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There are all sorts of paintable caulk/sealants at the hardware store. PRC sealant (fuel tank or fairing sealant) is very paintable also.
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  #7  
Old 05-01-2020, 06:25 AM
Kooshball Kooshball is offline
 
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Thx for the suggestions folks.
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