RE the 'chocolate option'
Yus, it is the tray that holds the chockies. I find it softens at lower temperatures than styrene. I sometimes use the leftover heat from the oven (on a tray on paper) a hair dryer, the iron (between paper). Localised reheating can be done with a soldering iron held close.
I have tarped loads that have held enamel for more than 20 years. I don't know about acrylic though