The main difference between resin bound and resin bonded surfacing lies in their porosity and application method. Resin bound is porous, allowing water to drain through the surface, while resin bonded is non-porous. Resin bound uses a mix of resin and aggregate that is trowelled onto a base, creating a smooth, permeable surface. Resin bonded involves spreading resin on a surface and then broadcasting aggregates over it, resulting in a rougher, non-porous finish.
Here's a more detailed breakdown:
Resin Bound:
Porosity: Permeable, allowing water to drain through the surface.
Application: Resin and aggregate are mixed together and then trowelled onto a base to create a smooth, even surface.
Appearance: Smooth, modern, and can be customized with various colors and aggregate types.
Benefits: Environmentally friendly due to its permeability, SUDS compliant, and can help reduce the need for drainage systems.
Examples: Driveways, pathways, patios, and areas where water drainage is a concern.

Resin Bonded:
Porosity: Non-permeable, water cannot drain through the surface.
Application: Resin is spread onto a surface and aggregates are broadcast over it, then rolled in to create a rougher, textured finish.
Appearance: More rustic or natural looking due to the exposed aggregates, with a slightly rougher texture.
Benefits: Slip-resistant, good for areas like disabled ramps, and can resemble loose gravel without the maintenance of loose stones.
Examples: Driveways, paths, and areas where a slip-resistant surface is needed.