I bought a few for large koi pond project tried a pail as per intrctions for mixing and iut set in 10 mins how to prevent early setting of mixture

Because Pond Shield is exothermic, heat will effect the cure time. if it is hot outside, the coating will want to cure quicker. The mistake most people will make though is they will mix the Pond Shield and then leave it in the container they mixed it in. Get it out of that container and either pour it into a large flat paint pan or right onto the floor of the water feature you are working on. Call us at 800-716-1545 if you need further assistance.Pond Armor

how much area does 1.5 quarts cover?

This depends a little bit on the type of surface. If you have a smooth surface I would say coverage is about 54 square foot. If the surface is porous it will be about 35-40 square foot. this is from my experience with the product.

1) if in places it is slightly damp can it still be applied 2) will it work on flag stones with concrete in between the stones.

No, surface to be applied to must be dry and clean...vacuum clean. NO loose material, chip away any loose material and anything that appears like it will be coming loose. If area is wet or damp, may be use a drier or blower to dry the area to be sealed. I would not use it on flag stone either unless you have a small area (I assume you are not walking on this flagstone, it's on a side wall or something cause the flag stone will use up a lot of Pond Armor. Pond Armor clear will put a "wet look" "shinny" finish on the flag stone. If that kind of a finish look is OK with you and the cost won't break the bank, go for it. A ruff surface like flag stone and concrete will require more Pond Armor than smooth surfaces. If you have a big area, I would only work with a quart of Pond Armor at a time on a ruff surface like that until you can see how well the Pond Armor gets applied. And remember, if you only apply Pond Armor to some of the flag stone, the remaining untreated stones will look totally different. Also, you may even have to put 2-3 coats on just because the Flag Stone is so ruff that it may look like you got it all, but you will see you missed some after it dries. (Unless your really good getting it all at 1 coat) Hope this helps. Stuff works!

Is this product considered “food safe”? Will it leach into soil used for edible plants?

I do not know the specific answer to your question. But I used it to coat the sides and bottom of my Koi pond and it is safe for fish and plants in a pond. This suggests it would be safe for edible plants as well. You may want to check with the seller. I contacted them and they provided help.

Product Dimensions	29.21 x 13.97 x 13.97 cm; 2.25 kg
Part number	SKU-SBLUE-QT-R
Item display weight	227 g
Material type	Epoxy
Item volume	1.5 Quarts
Manufacturer	Pond Armor
Item model number	SKU-SKYBLUE-QT-R
ASIN	B00CYOBODW

Pond Shield Pond Armor SKU-SKYBLUE-QT-R Non-Toxic Epoxy Paint, 1.5-Quart, Sky Blue, 48 Fl Oz (Pack of 1)

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