Stability, robustness and great appearance. Not only is GRP one of the most durable rainwater systems materials, it is also the most versatile. Colour can be changed to ensure it fits perfectly with any style and design.frp Gutters in chennai Can easily replace existing iron or lead rainwater systems that may have succumbed to the elements. Can be constructed in any style meaning that it can match the designs found on listed buildings whilst bringing all the modern benefits.