Custom Cut marine acrylic/plexiglass sheeting is available in rectangles with or without polished edges and thicknesses of 1/4”, 3/8”, 1/2”, and 3/4”. lor choices include opaque black, three shades of opaque white, clear, and four shades of tinted translucent. A full sheet of marine acrylic is 4’ x 8’. Marine-grade expanded PVC