Thank you for posting your feedback. DAP Plastic Wood Professional Wood Filler is filled by weight (NET WT.), not by volume (fl. oz.). Thick “putty/paste-like” materials such as this product use a mass-based unit of measure to display the amount of the product in the packaging, i.e., “NET WT. 4 oz (113 g)”. This practice is in line with the requirements of the Federal Trade Commission. The exterior dimensions of the can (Volume: fl. oz.) do not reflect the product package's claimed/communicated fill rate (NET WT.). To properly measure the fill rate of this product, the entire contents of the can would need to be removed and weighed on a scale. Relative to the size of the package, the observed fill rate you describe would be considered normal for this product. As this is a solvent-based formula, it requires additional “head space” for solvent expansion, this internal volume is designed to accommodate the fluctuations in the can headspace pressure, due to temperature changes (to prevent the lid from losing its seal). Plastic Wood has been packaged in this manner for decades. We are not clear as to how one could conclude that a product which clearly communicates the legal fill rate is “deceptive”. If you are dissatisfied with your purchase, the product may be returned to the point of purchase or returned directly to DAP for a refund of your purchase price. Instructions for this process can be found on the product package. Should you have any additional questions or require further assistance, please feel free to contact DAP’s Technical Customer Service Department at 888-327-8477.