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A: Ron Joseph of the Paint and Coatings Resource Center estimates that a gallon of paint weighs roughly 10 pounds. To determine approximately how much 5 gallons of paint weighs, multiply 10 pounds by 5 to get 50 pounds of paint per 5-gallon bucket.
How much does a 5 gallon bucket of paint weigh? However, salt water has a greater weight because of the minerals that are dissolved in it. Each gallon of sea water contains about 4.5 ounces of salt, which is about 3.5 percent of its total weight. A cubic foot of salt water weighs about 64 pounds. Because salt water is heavier, it is able to buoy objects up with a greater force, so objects float slightly better in salt water.