Hi Aarav I carried out waterproofing repairs on my concrete roof before the last monsoons. I had faced some leakages so I decided to call in a contractor to get the job done. He used a flexible waterproof coating that not only worked well that monsoon but is still going strong! I was very impressed with his work so I asked him what he used. He used a waterproofing compound called roff hyguard. I could see first-hand how effective it was so it definitely could be something that you could try.