In some cases I've coated the entire cone. Since rubber cement remains flexible doesn't effect sound. Don't use anything that hardens. That will cause a loss of low frequency response.

Norm

:Norm, thank you, do you also coat the middle section and does it affect the sound?
:Vinny A.
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::Hi Vinny
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:: I use Carters rubber cement with good results. Softens a brittle cone and has held up well over the years.
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::Norm
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:::Greetings to all,
:::Has anyone heard of or does anyone use rubber cement to coat speakers? Is there a proven revitalizing method for speaker material?
:::Thank you,
:::Vinny A.