Here's how I do it. With mold open I heat my secondary color while injector is heating in toaster oven. I shoot just the grub part of one side,( takes a steady hand) let it cool while heating primary color. I use a artist brush and alcohol wipe the grub body of the secondary color to insure bonding, after primary color comes up to temp. Put mold together clamp and shoot! Labor intensive a little but, worth it in my opinion. Hope this helps


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