Depends on the wattage and how you plan on laying it - but most probably yes.

You could go with one piece of 12 inch flexwatt per level - and that would be 200 watts used up. Or if you were planning on snaking the smaller stuff through it you should be able to do about 60 feet of the 4 or 3 inch (give or take) - I would think that's more than enough to heat that rack.