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  #1  
Old 05-16-2021, 12:30 AM
RVFan671 RVFan671 is offline
 
Join Date: May 2020
Location: Seattle
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Default What is this black stuff around my tank access cover?

I'm desloshing my '91 RV-4 tanks and the access covers had cork gaskets. I plan to seal the cover plate with proseal only.

I'm wondering what the black stuff is on the outside edge of the doubler for the cover plate? It is soft. Is it old proseal that broke down or something else? Should I try and remove it and put a ring of proseal around the outside edge of the doubler ring?
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  #2  
Old 05-16-2021, 02:52 AM
Robin8er Robin8er is offline
 
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Looks like old proseal to me.
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  #3  
Old 05-16-2021, 06:10 AM
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RV6_flyer RV6_flyer is offline
 
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Location: NC25
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Quote:
Originally Posted by RVFan671 View Post
I'm desloshing my '91 RV-4 tanks and the access covers had cork gaskets. I plan to seal the cover plate with proseal only.

I'm wondering what the black stuff is on the outside edge of the doubler for the cover plate? It is soft. Is it old proseal that broke down or something else? Should I try and remove it and put a ring of proseal around the outside edge of the doubler ring?
Quote:
Originally Posted by Robin8er View Post
Looks like old proseal to me.
I agree. Looking at the photos makes me think it is old polysulfide. (ProSeal (TM) or one of the other commercially available tank sealants.)
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  #4  
Old 05-16-2021, 06:37 AM
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Jpm757 Jpm757 is offline
 
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Could be Permatex Aviation Form-A-Gasket, this stuff never dries completley.
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  #5  
Old 05-16-2021, 10:35 AM
RVFan671 RVFan671 is offline
 
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Given that it is soft and I'm going to be laying down some new proseal elsewhere in the tank, should I try to clean up the soft stuff, scuff and add a fillet on the perimeter of that cover plate backer?
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  #6  
Old 05-16-2021, 11:48 AM
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Ironflight Ironflight is offline
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Quote:
Originally Posted by RVFan671 View Post
Given that it is soft and I'm going to be laying down some new proseal elsewhere in the tank, should I try to clean up the soft stuff, scuff and add a fillet on the perimeter of that cover plate backer?
Yeah, as much work as it might be, now is the time to get it squeaky clean - then you always know what you’re starting with, and the new Pro-Seal will do a good job on the access cover.
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  #7  
Old 05-17-2021, 07:46 AM
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Snowflake Snowflake is offline
 
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Definitely go the extra mile to remove as much of the soft stuff as you can. I didn't when I re-did my access cover seals, and now I have to pull the tanks again and do it because the soft stuff is leaking.
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