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Thanks Niel, Here is annealing information for Plexiglas Acrylic Plastic:
annealing-plexiglass.
Plastic likes to absorb moisture so watch the process and do not allow the plastic to bubble. Don't...

Just a comment about most thermoplastics...plex, etc. If you heat the surface up buffing them, they may crack or break later with no pressure or just a sudden temperature change. Alcohol can change...