I've stripped marble fireplaces with Nitromos, but would highly recommend klingstrip. I find it quicker and less messy. I do find that I look about 10 years older after using it. It seems harmless putty, but my skin seems to react to it much more than Nitromos. So I wear gloves, slap it on, cover in plastic and run! The next day it is less active and the paint comes off in one go.