I recently bought this roof coating and found out I did not need all of it for my metal roof. This is the best roof coating in the business. I have 6 five gallon buckets for sale. Buy as many as you need for $270 each. THE LAST ROOF COATING YOU'LL EVER NEED.GacoRoof 100% Silicone Roof Coating is designed as a protective coating to seal and repair existing roofs and permanently protect against leaks, permanent ponding water, and the damaging effects of severe weather.GacoRoof is the only coating on the market that stands up to permanent ponding water without bubbling, peeling or breaking down. It will stay flexible and maintain adhesion, even under permanent ponding water or snow pack. GacoRoof will not require a recoat. Do it once and you're done.100% silicone roof coating50 Year limited Warranty when applied properlyProvides waterproof protectionStands up to permanent ponding water without bubbling, peeling, or breaking downStays flexible and maintains adhesionUnlike other coatings that require recoating every 3 to 5 years, GacoRoof only needs one coating