This product is a mild cutting/polishing compound specifically formulated to restoring the outer (gel coat) finish on fibreglass boats. A fibreglass boat when left in the sun (unprotected by a cover) will slowly oxidise on the surface. This manifests itself as a faded "chalky" appearance. You apply this product in the same way that you would restore cars' paint. Use a dry cloth and rub, rub, rub. You can also use an electric buff with either wool or sponge rubber buffing pad. You will end up with a boat that looks like new. It will not harm the fibreglass gel coat. When finished, use our MQE110 Marine Polish to enhance the final result. Made in the USA. One bottle should do a 16' boat in fair condition