I have 3 of them that i use to keep remelt plastic hot. I typically hand dip tubes and I am left with a lot of scrap after I cut the tails so i have a ton of plastic i remelt in the microwave, place into the presto and keep re-melting until i fill it up. I then shoot the re-melt into swimbait molds.
I will say that it does keep the plastic from burning. I have not had any issues with the plastic burning, please note though that i don't typically separate the plastic by color when i re-melt so it usually turns into a greening brown color. I have attempted to separate all the chartreuse i had at one point and the time i did that, the chartreuse started out really bright and as i got towards the bottom, the green started getting kind of dull. I am sure i could've prevented this by adding heat stabilizer, however when it comes to burning the plastic, i have not had that issue.