Never begin polishing at the edge of the sheet. The wheel could easily catch the top edge and throw the piece across the room or at you. Forming Acrylic Plastic Acrylic can be heated to make it pliable. It will become rigid again when it cools. Never heat acrylic in a kitchen oven.
Explosive fumes can accumulate inside the oven, and ignite.
A strip heater is the best tool to form acrylic. This tool will only form straight line bends. Buy one from your acrylic dealer. The strip heater will heat just the area to be formed. Heat the sheet until it begins to sag at the bend line.