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Hmmmm.
I have had a 10" f5 optical set from the mid to late 90's, bought two of them in from the US, I suspect they were the beginning of the GSO line-up, but am not sure.
I have had the optics in a slew of tube reincarnations, the latest being a self-built C/F tube.
When I first started I used a solid U/O primary mirror cell, heavier than the mirror itself (and that is 5 kilos). After a while I sold this cell, and built a couple of others, one being a foam core covered with C/F, the other being two triangular "slabs" of 6mm S/S.
In both instances, (C/F or S/S) I use three small blobs of silicone adhesive to attach the primary to the "cell".
At no stage have I had deformed stars, or what I'd call pinched optics. Those that have looked through it are constantly amazed at the quality.
The 10" has sat unloved for a few years, but of late is my primary solar/lunar and DSO imaging scope, from DSLR through the PGR Grasshopper.
I'm not saying you are wrong with the condemnation of silicone, but I am saying I haven't had any issues. As our American friends would say "YMMV".
Gary
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