This site may have some info for you too.[http://www.audioheritage.org/]
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Aquaplas was a cone treatment material to add dampning and mass to a woofer cone. It is not a surround material. It was sometimes added to the front of the cone, as in the woofers on the JBL L-100, or on the rear, such as on the L-66's woofers and later versions. You should be able to replace a surround, Aquaplas-coated cones or not. BUT it is usually recommended to perform the re-cone on 70's era JBL woofers regardless... JBL makes OR at least made, unless they are no longer doing it, exact cone replacements for all woofers. It's just not cheap to re-cone.
Thanks all, yes, I tend to trust the tech who did these, and intend to use the two pairs as a quartet, and love them, so I should probably stay on-plan.
Xiekitchen, thanks for the clarification-- I had been advised by a third party as to what "Aquaplas" is, and apparently he was off. The LE-8T2 uses an untreated cone, unlike the LE-8T, and the surround material bonds very tightly to this.
Morgenholz: ok I think I see what your problem is.. the surround material cannot be removed very well without messing up or damaging the cone.. then yes it is better to just recone them.. AND JBL should be able to provide exact correct replacement cones and voice coils for those drivers ..? unless they cannot do this anymore? I had a pair of 12" woofers redone about 8 yrs. ago (by a local JBL authorized service center), no problems, they sound great.. just took a while for the new woofers to sort of 'burn in' and then they opened up with that JBL bass.
Xie, correct regarding surround material-- I also bought a pair of L166 had had the 12" surrounds replaced with OEM.
However, the white surrounds and black, untreated paper cones are no longer available, but are now replaced with equivalents including voice coils. I'm gathering that this is better than another forty years with original parts...