I agree with Mike. The wine will still develop in the bottle, maybe not to 100% but 99% is good enough for me. I suppose there are those of you out there that make wine and cellar it for decades but I generally only save a couple bottles from each batch of wine I make. I tend not to worry about the corks and aging, it allows me to worry about the funny smell coming off my next batch! That being said, I've used wax, it's a pain, it's a mess, but it looks pretty cool. I've had best results from using a spoon and ladeling wax over the top rather than dipping the bottle in. If you dip the bottle you get a more solid uniform look, but I wanted more of a Maker's Mark kind of look that when the top of the bottle is filled it will spill over the sides. I've also used the PVC shrink wrap capsules, they never shrink uniformly for me. I've tried using steam, a kettle, and over direct heat, but nothing yet. I haven't slowly dipped them into boiling water yet, maybe that has better results. All of that aside, I generally don't seal the top with anything unless I am presenting it as a gift, typically I write on the top of the cork the year and type that is it, just my experiences.