This product can be applied on hot or cold metal. Also Excellent for removing light scratches on plexiglass, bug screens and plastic lens covers. When using this product on metal, DON'T use it like you would an average metal polish. This is completely different. See just how little rubbing it really does take to achieve a shine. Once applied, fold a clean terry cloth towel and (DON'T RUB!) buff off, wet or dry, to a brilliant CLOUD FREE SHINE!