100% waterproof, but easily washes out of the filter using only water and No-Toil filter cleaner, Super tacky and attracts micro dust and dirt particles, while Micro-Flo additive maximizes critical airflow -- even when dirty -- to yield peak horsepower, Neon dye tracer lets you see that your entire filter is coated, No more engine-damaging dust getting through un-oiled filter sections, Biodegradable, Dyno-tested and race proven