Apply the glue carefully, and after applying, give him a few minutes to absorb. Apply paper to the windows tightly, and if you see that the gap is not seized to the end, you need to do the same again, that is, stick paper in several layers.
If you do not want such radical insulation and there is a matter of paper, you can make it much easier: Pieces of plasticine in size of the cracks wrap in plastic bags and carefully lay them with the cracks.
