We recommend mixing thoroughly for a minimum of 3-5 minutes. Be sure to scrape the sides and bottom of the container while mixing. Not mixing thoroughly may lead to curing issues. Ideally, you would pour the mixture into a second clean, dry container and mix for an additional 2-3 minutes. We recommend mixing no more than 1 gallon at a time. If you do mix 1 gallon, use a power mixer set to hand speed.