Marco Rock E Marco 400 Mortar Kit - Premium Stone Adhesive for Masonry, Brick & Tile - Perfect for DIY Home Repairs & Construction Projects

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.