Bugpac.....I wouldn't treat a gallon of plastic with stabilizer. Mostly using stabilizer is trial and error and ends up a balancing act between cooking time, volume of plastic, heat range of the cooking unit. I'd guess that most hobby guys aren't adding stabilizer to more than a cup of plastic at a time. Long-term heating or re-heat/re-melt offers some challenges too. Stabilizer is in all plastic out of the jug or box but the initial cooking cooks it out. Stabilizer is a constantly needed addition, not a one time thing. Clear or transparent colors call for more stabilizer use than solids or opaque colors.
Hobby injectors use it more often than commercial or production injectors.