Fuel Tank Sealant Adhesion & Performance

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GESchwarz

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Oct 23, 2007
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1,179
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Ventura County, California, USofA.
Is it expected that polysulfide will adhear to aluminum fuel tank part mating surfaces, or does the fuel cause it to debond. If it does debond, does the polysulfide continue to keep the tank sealed as long as the material stays in place, sandwiched between the mating parts, including rivets?
 

Mcmark

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Sep 24, 2013
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296
Location
Owings, MD
My Smith tank was leaking at the welds in several places. Cleaned, scuffed and taped for straight lines and applied pro-seal to all the welds on the outside of the tank. No more leaks.
 

Kyle Boatright

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Nov 11, 2012
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878
Location
Marietta, GA
Is it expected that polysulfide will adhear to aluminum fuel tank part mating surfaces, or does the fuel cause it to debond. If it does debond, does the polysulfide continue to keep the tank sealed as long as the material stays in place, sandwiched between the mating parts, including rivets?
It sticks very well if properly mixed and applied to a well prepared surface. But if it comes unstuck or becomes gooey, you'll have a leak on your hands. I've seen a few failures, which (IMO) seemed to be caused by people not stirring the material enough before application.
 

TFF

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Apr 28, 2010
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12,234
Location
Memphis, TN
Generally if it peels, it’s bad prep. 30 years down the road, care will play a role.
 
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