Thank you for posting your feedback. We are sorry to hear of your experience with the DAP Plastic Wood-X. Because you did not provide any background or details about your use of this product, it is difficult to provide a proper explanation for the issue that you have described. As indicated on the Technical Data Bulletin: "if staining, test wood filler with desired stain on scrap wood before filling to ensure desired stain color." and "If wood is to be stained, stain before filling with wood filler. Then use stain to develop desired final finish.” Should you have any questions or wish to discuss your project, please feel free to contact DAP’s Technical Customer Service Department at 888-327-8477.