Re: Silicone versus Glazing for sealing replacement glass
Like DJ said, it's more about the application and your preference. In older metal frames and wood windows, glazing is the best because you set the window into the glazing and then apply a second bead over the top. It takes a bit to get the hang of it, but the great thing is if you mess it up, you simply scr-ape it out and reuse it. You can't do that with silicone, nor in this case is silicone going to be workable due to the quantity being used and tooled.
On aluminum and vinyl windows bedding the glass into silicone (beutyl caulk is better ) is acceptable/preferable because there is an exterior rubber/metal trim the goes on to cover the perimeter of the glass. Run a bead of silicone around the frame, press the glass into the frame with an even reveal around its entire perimeter (use shims to hold the bottom space while the silicone dries ). Let the silicone fully cure before removing any of the oozed out material from the inside of the window. When it's cured, you simply run a utility knife along the frame and the excess silicone will peel right off. If you try to play with it while wet, you'll have a serious mess on your hands. Beutyl caulk is better because it's more stable than silicone. You'll apply and handle it similarly as silicone.
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