Sand is used in resin bound surfaces for a couple of different reasons. Mixing fine sand in with the resin and gravel will strengthen the compound. Adding some extra strength to resin bound driveways that are on an incline is beneficial.
Sand can also be sprinkled on the surface of resin before it cures to provide an anti-slip texture. This stops a resin bound surface from becoming dangerously slippery when it rains.
Sand used in resin bound driveways or pathways is fine and kiln-dried. Reducing the amount of moisture in the sand is essential to prevent an adverse reaction with the resin. Industrial grade sand is the best to use with resin surfaces. It ensures a predictable and safe result.
Without sand in the resin mixture, the surface is smooth which can be hazardous when wet or icy. Pedestrians could slip, and cars lose traction on a smooth driveway.
Sand to be used with resin installations is available in a choice of sizes depending on the size of the project. As a rough guide, generally, a 6.25kg bag of sand is sufficient per 100kg of resin mix. Make sure you have enough sand for the complete project before you start to complete the job to the highest standard.