A: Loctite Marine Epoxy is not a sealant as it is not flexible when cured but instead rigid. It can help seal leaks depending on the nature of the leak.
A: Thank you for the question. Using Loctite Marine Epoxy for the intended repair is suitable assuming the surface to be fiberglass (otherwise your success will be dependent on the composition of the material to be repaired) and assuming the severity of the crack is not too great. Keep in mind that this product will take at least 24 hours to reach full strength and is dependent on temperature, humidity, and thickness of epoxy applied.
A: Yes, The Loctite Epoxy Marine is suitable for this purpose
A: Yes, the Loctite Marine Epoxy can be sanded.