I'm having a leaking problem with one of the drain plugs on my Intex pool. The plug on the inside started leaking a bit two years ago. I solved the problem by sealing the outside cap with some teflon tape. That stopped it from leaking for two seasons, but now the cap is cracked and it's letting the leak through. It's not gushing out, it's just a slow trickle, but I still need to fix it somehow. I tried using a standard PVC cap, but of course nothing with Intex is standard and the threads are different, so it's not sealing. I found what appears to be a replacement cap on Intex's website, but I was wondering if I should try sealing the inside plug shut instead. I don't use the drain plugs to drain it, I use a pump, so I don't care if they're permanently sealed. I don't think that outside cap is meant to hold water, I think it's just there to cover up the treads that are used to attach the garden hose adapter. Is this a good idea or a bad idea? If it's a good idea, what should I use to seal it shut? PVC glue? DAP contact cement? Silicone? Something else?
Edit-I forgot to mention that I wouldn't have to drain the whole pool. I just started filling it, so I would only have to drain an inch or two to get it below the plug.