We’re sorry to hear our product didn’t work as you expected. OSI QUAD Window, Door & Siding Sealant is one of our best-selling sealants over the last 35 years and is used primarily by professionals in the siding, window, and door industry. As long as your PVC was properly cleaned and prepared, OSI QUAD should adhere to it. Based on the description you provided, it sounds like the product you purchased may have been expired or defective. Lot code information can be found on the cartridge. As with all items sold through retailers, a product exhibiting an issue should be returned to the place of purchase for exchange or refund.