Thank you for posting your feedback. We're sorry to see your low star review on DAP Phenoseal Does-It-All. DAP Phenoseal Does-It-All is considered fully dried within a few days of application (depending on the joint size, temperature and humidity). After the product has gone through this initial drying phase, additional shrinkage/volume loss does not continue. The "shrinking" that you are referring to is not an artifact of the sealant's internal performance, rather it is the result of tension (pulling force) of the surrounding materials. It is not uncommon to observe shrinkage in many building materials (particularly wood), during seasonal heating. Excessive joint movement can ultimately lead to cracking and/or loss of adhesion. 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 about your project and to suggest an alternate (more flexible) product.