I recently purchased a Summer sun pool that is basically an above ground pool downsized that holds approximately 700 gallons. It has a vinyl liner with a drain at one end of the liner. The area where the plastic drain fits into the vinyl liner was not sealed properly resulting in a leak. It looks like they only sealed half of the circular drain to the liner. My question is what can I use to finish the job. Remember we are sealing a plastic drain to a vinyl liner. Can I use silicone? Is silicone safe on vinyl? Should I use an aquarium sealer or a bathroom type silicone? Look forward to your replies. Thank you.