Q Cells are lightweight microscopic glass bubbles utilized as fillers in conjunction with Polyester and Epoxy Resins. Possessing commendable compression strength, Q Cells are primarily employed to increase volume without significantly increasing weight. Their suitability for fairing applications is noteworthy. Q Cells offer the advantage of easy sanding, making them an ideal filler for affixing fin boxes and legrope plugs, as well as repairing "dings" in surfboards.