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Kit comes complete with mortar powder, liquid with an acrylic polymer (to keep the joint from getting brittle in water), instructions, mixing spatula and a bucket to do the mix in.
If you do not need the entire batch, simply rinse the bucket and put the rest back, put the lid on and store in a cool dry place.
Affix to rocks, sets in about 20 minutes, can be carefully handled in an hr or two and will fully cure underwater once set.