I/ve been using the essential since it was first offered. I as a rule cook to 360 degrees on the initial cook. Plastics I have made using it and kept in Plano boxes stay as clear as there were when they came from the mold. HOWEVER, baits in the same box a year or more old will exude an oil that tends to make a mess of things if left there. I remove all of the baits a couple times a year, give them a bath in warm water with some Dawn dish soap in it. They get rinsed in warm water and dumped onto a large terry cloth towel and fluffed around a bit then left to air dry. Then I wash the box using the same water but with a stronger dose of Dawn. Spray rinse and shook to get the bulk of the water off the box and left to air dry as well. When everything is dry I put things back where they were and I'm good for another 6 or 8 months.
The oil that gets exuded is from every day heat, likely moreso if the boxes are left in a boat all the time. The oil isn't a sign of anything amiss. It just naturally occurs. Even on fully cooked plastics, but they stay clear. Now if your baits are cloudy, they've either been subject to storage in high humidity or they were not gotten to the 350 degrees that the raw plastic needs to get to fully convert and the hand help surface reading infrared thermometers are NOT what you should be relying on to get the temperature of cooking plastic. You need to use the digital probe type of thermometer to be accurate.