Why can’t you glue acrylic sheets of Quarite® or Lucite XL® with solvent?
Both materials are not in the same category as regular acrylic sheets. These brands of material fall into a category called “cross-linked” acrylic.
What this essentially means, is that an additional chemical has been added to give these materials greater resistance to harsh chemicals and staining agents. As a result, they resist the solvents that would normally dissolve and fuse regular acrylic sheets. To properly bond these types of materials, you will need to use adhesives, rather than solvents. These take longer than solvents to cure, so many fabricators rule them out right away because of the effect that curing times have on large volume production.
Although, I have observed that “cross-linked” acrylic can be solvent bonded with regular acrylic, though the strength of the bond may not be as strong. Consider the end use of the product before performing this type of bonding.