Before I go I will share other tip regarding applying acrylic paint with the moisturizer. I recommend using a thick cream one, like Leather Therapy not other conditioners that are more like lotion.
Once I got at Goodwill a white
Coach crossbody, it had a pen mark that someone tried to clean, rubbed too hard, then used shoe polish trying to cover it, but of course was still evident and a mess. After I cleaned the whole bag I used the white acrylic paint with a lotion moisturizer that I had used before to touch up corners or an edge and it worked. This time it worked to cover the spot, but still was noticeable due to the white leather having faded etc.. I decided to slightly do the whole bag. When dry the bag was stiff, I had to use many coats of Leather Therapy to make it better and the color was not uniform. Live and learn.
Then just now a friend asked if I could help her clean a MK in white leather that had worn out corners, scratches, etc... I did the corners for her the usual way, and she wanted the edges on top too, the straps...., at the end she said to do the whole bag, I didn't want to but she insisted, this time I mixed the white paint with the thick Leather Therapy and wow! The bag turned out like new, soft, even color... my friend loved it.
So cream versus lotion or Coach leather versus MK... I do not know, but I will use the cream from now on all my rehabs.
