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If you want a driveable permeable surface that stays looking bright outdoors, choosing the right resin binder is essential. Non-yellowing polyurethane is specifically recommended for helping light-coloured aggregates—like white pebbles—retain their original appearance over time.
What Is Non-Yellowing Polyurethane?
Polyurethane binders are commonly used in resin-bound surfacing, thanks to their flexibility and resilience. A “non-yellowing” grade is formulated to better resist discolouration from sunlight exposure, which is particularly beneficial for outdoor floors using white or very light-coloured stones. This property helps preserve the natural tones of aggregates, especially in open, sunny locations.
When Should You Use It?
Non-yellowing polyurethane is especially important when your design includes white or pale stones, such as Carrara marble chips, where even slight discolouration would be noticeable. For coloured stones, a low-yellowing epoxy binder may suffice, but for white aggregates, polyurethane offers superior protection against UV-induced yellowing, helping surfaces maintain their fresh, clean look.
Buying and Application Tips
- When planning your project, confirm which aggregates you will use—select non-yellowing polyurethane binder for white granules.
- Many complete kits such as the Flowstone Complete Permeable Floor Kit provide clear resin selection guidance based on aggregate colour.
- Always apply the resin according to supplier instructions, choosing moderate weather for best results and allowing full curing before driving on the finished surface.
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Making the correct binder choice is a crucial step in building a durable, attractive permeable drive. For comprehensive setup and product recommendations, see our full guide on how to build a driveable permeable surface.