Ivy Rhiannon
I don't know if I actually "seal" my deck, but I guess I do something similar. I put a couple of cards on top of the deck when I guess I'm hopeful for something (I know this sounds superstitious, but...) like, for example, if I want some inspiration or creativity, I'll place the ace of wands at the top, as I'm putting the deck away.
As for "rituals," I know a lot of the myths that have grown up around the cards are just that, myths and urban legends, but I do find that putting decks in red bags (or red cloths) does seem to recharge them at least a little.
And I do something else, I don't know if other people do this; I put strands of my hair (left over from combing) in my tarot bags, and it seems to focus the deck and add to its potency as a reading tool.
very cool lokisen!