Good and sound advice, no doubt. I am also sure there is a right and a wrong way to make them with silicone (he lent me some Rubson), as it is the case with tape, hot glue, or pin hinges.
I tend to trust my friend, his help has so much improved my game with gliders!
He has used silicone hinges on some of his foam planes (he also has an EZglider for the days the wind is too gusty to fly his big gliders, he repaired this way after a landing in a wire fence hidden in tall grass).
My friend has been building planes for more than 60 years (also worked as a professional builder of RC planes for scientific projects).
Members of the club give him their wrecked planes when they despair from being able to rebuild them. One or two weeks later, they come back better than new.
He has shown me how bad build were wood ARF from major well known brands (no cheap HK), were wings and fuse had up to one third of unions that were never glued.
He regularly flies 3 to 4 m ws all wood gliders he builds from scratch, varying from vintage to high performance (of his own design). For them, to my surprise he uses the covering film of the wings for hinges.
Here is one of his last builds, she flew perfectly from day one after a good tow.
Truly a knowedgleable guy in scratch building to have around.