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I know some people have had issues with bubbles in fresh plastic. For dark colors this is not really a problem. Awhile back I was pouring for a customer that is real fussy about color. So I made up four quarts one in each cup. While I was injecting I had the uncooked one resting on a griddle that was set at about 250. So it pretty much preheated the plastic. It takes me awhile to shoot these baits so they were setting on there for awhile. When I cooked them no bubbles. Seems to me the heat made the air trapped in the resins let go. So on the next one I took the temp of the preheated plastic and it was about 210. Same thing no bubbles. The other method is to put the plastic in a vacumn chamber and remove the air that way. I now have a four gallon vessel to remove air. This way works much faster that the preheat way but both seem to work great. This way I can really mix my plastic good and remove air just before I use it. I know there are plastic out there that don't have a bubble issue but they have a premium price tag. Some now are selling plastic that has been vacumned but they cost more. And if you aggressively mix it you could put it back in then you paid extra for nothing. Purchasing a personal vacumn unit may sound expensive but in the long run it will save a lot of time and frustration. A simple cooking pot and a clear lid with a gauge and some valves to regulate what is going on. I say clear lid so you could see what is going on in side. The plastic grows at least two times it's volumn so you have to watch. The griddle way is much cheaper but takes much more time. This process takes more time as the plastic really has to be there for awhile to let the air release. Either way you at home can choose a way that works for you. And now that you know the bubble issues can be controlled by you and not who you buy it from. Mix your plastic as much as you feel it needs and be assured there will be no more bubbles. I know of at least one guy that does it after it is heated but with it growing so much I will stick to doing if before. Hope this takes some of the mystery out of the bubbles in plastic. Frank