The sealing acrylic urn vault of the invention includes a generally square sheet of ⅝″ cast acrylic serving as the base and a generally square top portion which will have four adjacent side walls bonded to its edges and protruding downward. Each opposing side wall will be bonded length-wise to each adjoining side, creating a seamless cast acrylic box, open at the bottom, that lowers onto the acrylic base. Attached to the base are four 0.625″ tall ⅝″ thick acrylic guide rails, bonded equidistant from the outside base edge on all four sides of the base. This “railing system” is the fastening guide for the acrylic top portion which lowers onto the base with the inside of the four side walls bonded with the outside edges of the four guide rails.
