You want clear and you want paintable. Don't make it a nightmare for
Lexel would be a reasonable choice.
Poke around that web site - you'll enjoy it.
Tricky question. Silicone is clearest, but not the best choice,
possibly, if your trim is wood. Paint/varnish/stain will not stick to
silicone, so if you will be renewing finish, a paintable caulk would be
best choice (same color as wood if the wood shows from outside). Are
these old wood windows? If so, the problem is outside - need glazing.
If the window is alum., then clear silicone on the outside is likely
I have not found silicone to be clear at all. If you want
opaque, maybe, but for clear you need something besides silicone.
Lexel is supposed to be clear and stay clear and is used for
things such as glass block due to that fact. Every other type
of clear that I have used will yellow with age.
If it were me, I would probably use Lexel, if clarity was the
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