Anyone ever made their own injectable marinade?

melt butter and margarine (equal parts)over a stove, bring to a boil until the water boils out, then I add in seasonings and a good bit of garlic and let simmer for 15-20 minutes, then I let it sit until room temp and use the injector.

Last one I made was butter, Cajun powder garlic sauce, nunus seasoning, and garlic powder. It was awesome

You can also add some strained italian dressing. I've never done it, but someone I know swears by it. Just make sure to get the herbs out, and enjoy the liquid with some melted butter, etc.