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? How to Make Fishing Lures with Alumilite Resin Amazing Clear Cast What if I want to expand the volume of my resin? What is durometer and viscosity, along with other terminology that will help me understand, what I am looking for, what I need and what I am getting? Comments 0 comments Article is closed for comments.