1. If you are standing outside and looking at the window glass, there is like a gasket between it and the frame that holds the glass in place. I want to add additional sealing there, along the frame. Is it window putty I should use or some form of silicone?
2. When the tinsmith had installed a new window sill for the new window, he said it didn't turn out quite right, and that I should use something to seal the holes. However, he didn't say what. Silicone?
SMP/MS-Polymer construction sealant is what I would have used in both cases. Highly weather-resistant, flexible, and paintable. It also works well for windows (available in black) or if you use synthetic putty but it's based on the same principle. I would absolutely not use real silicone, bathroom silicone, or acrylic sealant.
1.
I don't know if it can be sealed in a good way, but I'm interested in the answer myself. In the worst case, the glass unit has to come out and a new strip inserted.
2.
Looks a bit odd. Does the trim stick inside the reveal?
Anyway, it would have looked better if the drip cap was made as wide as between the reveals and then notched into the trim.
In any case, some sealant would have been needed against the reveal. Possibly the slots for the drip cap in the window need to be extended a bit.
Do you think it would be more worthwhile to get a sheet metal worker to make a new sheet with better fit rather than patching the holes? He made some mistake when measuring and compromised... And I don't know how the wood goes there. I think the carpenter gave me some kind of explanation for something and quickly said the sheet metal worker would fix it.
Regarding the window trim, the innermost part of the trim is intact, so the glass is stable. It's just the last millimeters outside the glass, outside the frame, that have been cut away. However, I was thinking of ensuring the tightness with something.
My seals between less well-executed flashing and casings tend to crack, which means I have to keep an eye on it, which is disturbing. Maybe I should try Sikaflex as mentioned instead of any random building sealant.
It might not be possible to solve it more neatly for you, and I understand the hassle of bringing in a sheet metal worker. But I would probably have done that or made my own flashing.
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might be hard to file a complaint about the sheet metal now.