Thank you for posting your feedback. We're sorry to hear about your experience with DAP Plastic Wood. Based on your description of the product's texture, it would appear that you may have purchased material that was not properly sealed or aged/beyond its normal shelf life. If the package is not properly sealed or as the product ages, it will thicken/dry to the point of becoming difficult/impractical or impossible to use. At your convenience, please contact DAP’s Technical Customer Service Department at 888-327-8477 so that we can obtain some additional information from you, when calling in, please have the product package available, as we will need to collect production information from it and so that we can reach out to the store location where you purchased this product.