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I used it on my trailer bed and has worked great. Don't see why it would have any effect on a garden, any chemical vapors should evaporate before it would leach into the ground. As precaution, I would wait a week or so after a rain, just in case, before planting the garden.
Not sure about freezing, but I was generally disappointed with how well it protected the wood. I know exterior cedar is especially vulnerable to weathering over time. This may have been the wrong product for this purpose, because in less than a year it seemed to have little effect. The rough cedar boards turned grey and lost their attractive appearance, not much different than what you would expect with no protection at all.
Polymer loading, Lumber-Seal is more construction based, Garden-Seal is for Gardens
Safe for Docks, marine tested for non-toxicity.
No, our product is water-based and will not seal over oil based products.
Yes, decks can be sealed-but must be stained or painted afterwards as usual.
If your deck has been treated in the past and surface in good condition one coat should do it.