How much volume can I expect out of 5 lbs of Microballoons? Monica P. February 12, 2020 16:39 Updated 5 lbs of Microballoons equates to approximately 3.5 gallons. Related articles What if I want to expand the volume of my resin? Are Alumilite liquid dyes suppose to be this thick? Why do I have tacky spots after applying Amazing Clear Cast? Are Alumilite Casting Resins waterproof? Can I paint Alumilite? Comments 0 comments Article is closed for comments.