Thank you for posting your feedback. We are sorry to see your low star review on DAP Drydex Wall Repair Patch Kit. Based on your description of the difficulty you encountered sanding the product, it appears to have been overapplied. Consider the use of an open sanding mesh should more extensive sanding be necessary. Should you have any additional questions or require further assistance, please contact DAP’s Technical Customer Service Department at 888-327-8477.