While building your house, windows are fixed as soon as the brickwork is done. The waterproofing part comes later most of the times. This leads to spreading the gaps between your window frame and the wall, causing leakage problem. Here, you can apply Dr. Fixit Silicon Sealant to fill the gaps and avoid water ingression. It is one of the popular internal wall waterproofing solutions in India, which is UV resistant and highly elastic in nature.