I have built a lot of cages, and have never used silicone for sealing anything. I do use regular Polyseamseal caulk or whatever the real cheap stuff is. I basically use it to fill any cracks or slight gaps along edges and paint over it. It is the cheapest stuff in tubes from the Homed Epot. The 100% GE silicone stuff is always like five bucks a tube.
I did have a very large glass aquarium cage I used for a headboard in my batchelor days that held an enormous water moccasin. When I moved, I went to move the tank (without the snake in it at the time) and found to my horror that the silicone had come completely unstuck from the glass, and the whole thing basically fell apart so easily it was like a comedy movie. I had no clue- I thought the thing was really well made and secure. The snake obviously never even tried to push the glass, or it could have easily done so. Live and learn. No more aquarium cages since. And I don’t trust silicone, either…
Your cage looks great. Thanks for sharing. Hope to see it as you complete it too!

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