Glue Advice Required

[Jozua_2019]

I need help.

I have varnished the internal panels of my speaker boxes to protect it from absorbing vapor.  Then I glued 4 mm rubber panels to the inside using Bostic Contact glue.

Today I noticed that what should have been a solid bond is just a tight bond and with a little but of pull,  the rubber panels can be pulled off.

Re-gluing is obvious.

Any advice re what product can be used to secure a strong bond ?

 

[Norval]

 

[croak]

 

[Jozua_2019]

 

[croak]

 

[Jozua_2019]

 

[marantz123]

 

[fredeb]

 

[2wice]

 

[Gerlach]

 

[oradba69]

 

[SeanS]