There are several potential problems related to form-in-place seals.
This is a type of a seal that can be removed and reformed in the fleet
environment, but care in the forming of a new seal is critical. A common
problem occurs when the stand-offs and the seal thickness is too thin for the
door flexibility and fastener spacing. Another problem involves the
gasket having small voids or areas of poor adhesion which results in poor seal
integrity. Consistency of quality is an inherent problem with these
"home-made" seals. Consider ease of access and working space before
specifying a form-in-place seal.