Hi there, thank you for your review. I'm sorry to hear about your experience using the Urethane Alkyd Enamel Paint. That is not normal and certainly not the experience we want for our customers. Stirring the paint for 3-5 minutes to ensure all contents are mixed should result in a blended smoothie consistency and not be clumpy or contain dried paint. I recommend allowing the paint to dry for 24 hours before test sanding a small area, and if the paint gums up, additional dry time may be needed. Customer satisfaction is important to us, and we appreciate your feedback. Please reach out to us directly if you need further assistance. Our customer care team is happy to help you! - Randy