Don't try acetone on acrylic (Perspex). It will craze the surface. Tensol
https://www.amazon.co.uk/12-Acrylic-.../dp/B01MF90AFS is the stuff developed by ICI to do the job. After enough practice it's possible get an invisible join. Much easier to use is the Simplex Rapid I mentioned in the other thread. But it leaves a bead along the join and is unlikely to look pretty.
Cheers,
GJ