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Weld-On #3 is a very good solvent for bonding plexiglass.

I've always used Weld-On #3. If you're building poleax cubes, use a syringe to get the Weld-On in the corner. Try to angle your materials so that if the liquid runs, it doesn't run into the surface of the poleax, just in the joint. Not an easy task, but I did it for many years. Also, make sure that your edges on the poleax are clean and smooth. I use a metal scraper to smooth the edges.

I've always used Weld-On #3. If you're building poleax cubes, use a syringe to get the Weld-On in the corner. Try to angle your materials so that if the liquid runs, it doesn't run into the surface of the poleax, just in the joint. Not an easy task, but I did it for many years. Also, make sure that your edges on the poleax are clean and smooth. I use a metal scraper to smooth the edges.

I use a jointer to smooth the edges and the flame polish them.