Polymer Products Google it sell gallon sets of laminating epoxy in both the West Systems brand and a Polytech brand . This is usually used for making fibreglass boats or carbon fiber products but it sets quite clear albeit yellowish and can be used for casting or pouring into large voids . The West Systems brand is meant to be more clear , but I ' ve not used it . Bubbles are an issue with large depths . They also sell a clear casting styrene 2 part 1001 mix ratio which sets very very clear but suffers major shrinkage . You can use this for encapsulation , but not for pouring into voids as it will pull away from the sides of the void as it sets up . This is also much less likely to entrain bubbles . The pioneer 5 minute clear epoxy you can buy in small tubes at hardware stores is clearer than the polytech epoxy sold by PP , but I believe it ' s only sold in small tubes , probably because you wouldn ' t be able to mix a large quantity of it before it started to set up .