I have a Vermont Castings Intrepid II 1308 w/ catalytic. The vertical seams between the side plates and front of the stove had lost their cement and were leaking. I cleaned the seams thoroughly and filled them with Rutlands stove cement. All was fine for about two weeks and then the new cement started to crack and fall out leaving air gaps again. I refilled the seams and two weeks later it's happening again. Is there another way to seal these seams? Another type / brand of cement? thanks