1 gal. EkoFlo Permeable Pebble Binder - The Home Depot
You must follow the directions. Most important wash and dry your stone and mix in small batches. I found mixing a third of a 5 gallon bucket first then adding another 3rd of stone with more product allowed me to make sure all the stone was coated. 1 gallon allowed me to coat 16 bags of pea gravel. My projects came out beautifully.