I`d pretty much expect FK1119 to be more effective in any instance as IME (which is far from exhaustive...Ron K. could provide a much more informed opinion that I can!) it`s simply a more potent product.
But hey...maybe in some instances the stuff in "A" will just happen to be the *exact* right thing to solve a particular problem whereas the stuff in 1119 is not.
Aw geeze...wish I were more knowledgeable about the two products...both have always done what I expected them to, I just chose the FK for cars that were in especially nasty condition due to it being a nastier product. Hardly scientific huh?
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