Repair driveway expansion joint sealant during winter?
I use a product called "Pli Stix". I am sure your local home center will carry something similar or order it on line. I haven't tried this product in the winter but I can't see why it wouldn't work. It is packaged in a 30ft coil. You clean out the crack using and air hose, leaf blower,shop vacuum etc to remove the debris. You fill the crack with the material and melt it in place with a heat gun or propane torch. The product melts and conforms to the opening.