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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.
It would depend on the type and quality of paint. A 5-gallon bucket of paint starts at around $35 for a low quality flat, up to $300 for a top end oil based high gloss paint.