What is the best clear to use to seal Model Master enamels before applying MIG products? I usually use Tamiya paints but I have quite a bit of Model Master on hand I want to use. Thanks

Since you are using enamels, I would recommend using Future (acrylic floor polish) or similar acrylic-type barrier as anything in the MIG product line that is oil-based will attack the enamel paint if you don't have something to protect it.