How much volume can I expect out of 5 lbs of Microballoons? Monica P. November 05, 2020 20:05 Updated 5 lbs of Microballoons equates to approximately 3.5 gallons. Related articles Why do I have tacky spots after applying Amazing Clear Cast? Are any Alumilite casting resins food safe? How to Make Fishing Lures with Alumilite Resin Amazing Clear Cast What if I want to expand the volume of my resin? Comments 0 comments Article is closed for comments.