> wouldn't the "Grafitti Stripper" take the duco finish as well?
Nope... there are clear-coats over the Duco paint job. The first application of stripper will remove the paint layer on top, but it isn't strong enough to eliminate the clear-coat layers. (Mild stripper, but very effective.) It would require additional applications of the grafitti-stripper to dissolve the clear-coats. I'm betting there's a Duco finish under there. I never would have recommended the grafitti-stripper if I thought that using it would compromise the factory Duco finish.
Good question though! Using any other stronger stripper -would- hurt the Duco.
John