i work at a duracool dealer. I have used it in my car (actualy i did it today).Not because i sell it but i would go with Duracool over red-tec. I've heard bad things from garages about it thew the city. At my work the duracool is 11.95 a can (part #f006) the sealer (#de0011)is about 20-22 bucks. red-tec and dura cool do the same thing but the dura cool seems to survive winter a little better than red-tec
