Fabric Finishing - EkoFill

EkoFill protects the substrate from ultraviolet (UV) radiation by both absorbing and reflecting UV radiation. This is an extremely important characteristic for fabric covered aircraft as well as some composite aircraft and components. During testing for the STC, the complete fabric process containing three crosscoats of EkoFill was tested for UV resistance. That test involved a very intense UV exposure simulating many years of sunlight. The standard for that test is that the fabric can lose up to 20% of it’s tensile strength and pass. The result was that it lost 0.5%! EkoFill is extremely effective at stopping UV radiation and ensuring that fabric and composite components will last for many decades, even when stored outside.

https://stewartsystems.aero/wp-content/uploads/EkoFill-Instructions.pdf