If your project requires two or more applications to complete the job then we recommend using an epoxy mortar rather than silicone because this product has better adhesion and flexibility so it won’t crack over time like some other types might due to temperature changes. By applying these kinds of products in layers you are able to achieve the best results while also saving money by not having purchase all new materials when trying to repair damage from cracks caused by previous caulk jobs, but keep in mind that they come in a variety of different strengths and each one has its own unique set of requirements for application.