how to use dr fixit - #41682

I am really struggling with a leak in my basement and I just don't know how to use dr fixit properly. The last time I tried applying it, I ended up with a big mess and some parts were just seeping through again. I watched some videos that explain how to use dr fixit but it seems way harder than they make it look. Last weekend, I saw some water marks on the walls after heavy rain, which was super frustrating because I thought I had sealed everything up good last time. I remember the sales guy at the hardware store said how to use dr fixit for waterproofing, like mixing it with some compound? But I didn't really catch all the details in the hurry. I feel like I'm doing something wrong. Is it more about the preparation? Should I be cleaning the area more or applying it in a certain way? Do I need to be careful of the weather when I try again? Also, do I have to let it dry for a specific time before it’s considered effective? Ugh, this is really stressing me out! Anyone else had trouble figuring out how to use dr fixit effectively? I just want my basement to stay dry for once and not constantly worry every time it rains! Any tips or steps would be super helpful!