Thank you for posting your feedback, we're sorry to see your low star review on DAP DryDex Spackling. This product is designed, marketed, and labeled for use on minor cosmetic repairs, such as: nail/screw holes, cracks, etc. (not for large format repairs). When filling deep, but narrow defects (such as a screw/nail hole), the filler must be “packed” into the hole a thin layer at a time, with a drying interval between. The most common cause for the issue you describe as “shrinkage” results from application in excess of the recommended depth. As indicated on the product package label and supporting product literature: "4. One application is usually sufficient for small repairs. For repairs deeper than 1/8”, apply two or more layers allowing spackling to dry between applications. 5. For a smoother finish, dip putty knife in water and lightly smooth spackling. 6. Spackling will change color to white when surface can accept a second application or is ready to be painted or sanded in 1 to 5 hours." Because you did not provide any background regarding your project, application technique or application conditions, it is difficult to provide a more detailed response in this format. Should you wish to provide us with this information, so we can better address your concerns, please contact DAP’s Technical Customer Service Department at 888-327-8477.