No, not new marinade, just flip them and move them around. I use a plastic container to marinate, never get it quite full of marinade, by that I mean I never make enough to cover the 3 - 1/2 ribs, I cut them in half to fit. So every 12 hours or so, I open the container and rotate the bottom to the top and the top to the bottom. The same marinade is with every separate batch of ribs I do, from the moment they go into it until the moment i wash it off 24 to 36 hours later. But every marinade I make, is just a bit different than every other one I have made.