Waterproof Tape Using Visqueen As A Pond Liner 5m Diameter. What Type Of Tape Would Be Most Suitable To Ensure Its Waterproof?

Using visqueen as a pond liner 5m diameter. What type of tape would be most suitable to ensure its waterproof? - waterproof tape

I intend to use 2 layers Visqueen at right angles to each other. I need to band together and hold the plastic and waterproof. I have sandy soil