There are a thousand different products out there that really just don't work when you live in Pacific Northwest. The best way I have found that really works to keep out slugs and snails is copper! It actually dissolves a slug like salt does, only the copper is the best way to keep the slugs and snails out of your pots and container gardens for good. No messy chemicals and no having to reapply every time it rains. Copper is completely safe around your veggies and herbs, pets, kids, and environment.
There are several very inexpensive varieties of copper tape that can be found at almost every store that carries garden supplies. Also next to this you may see tiny pieces of copper mesh. Don't bother with that since you can go to the dollar store and pick up copper pot scrubbing mesh for much less money.
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Having tried everything possible known to man to rid my garden of slugs, I came across an item on ebay that I thought may just work, a roll of sticky back copper tape.