WindJammer (or here for the flash-intensive advertising site).
This product is a rubber-cement-like liquid in a pressurized can that you use to seal windows, in the manner of rope caulk.
- Applies quickly and easily, without the mess of unwinding the roll, deciding whether you need one bead or two (or three), and trying to keep the caulk up while applying it. Especially welcome on the top edges of windows.
- More adhesive-like than rope caulk - stays in place better (so far)
- Can be applied in as thin a bead as you like, for very small cracks.
- Clear gel is less aesthetically annoying than grey or brown putty.
- About twice as expensive as store brand rope caulk. $8-9 for a can that covers two or three windows worth of cracks.
- Leaves a serious solventy smell as it cures. This is especially awkward since you're in the process of sealing air into your house.
- Hard to find; so far, I've only found one can, after looking at two local stores and a Home Depot. The local store that had it is selling it quickly enough that they were out the first two times I checked.
So far I think it's a good match for my renter-with-disposable-income lifestyle. I'll be sure to note new things as I learn them.