Canon printer ink will not dry?

i recently helped a family friend with an HP printer problem with photo's

problem very much like you described

two things
it was set on plain paper

the big one, the paper was loaded print/glossy side up
in her printer it must be print side DOWN in the tray
the ink was being printed on the wrong side of the paper

try a plain paper test and mark one side of the paper with a mark on one corner someplace
see which side is getting printed on and how much ink is being used

I have had best results with another Canon ink jet printer that uses Pixma ink using only Canon photo paper. I have used other inkjet photo paper in that one and it has not run but the images were crisper with Canon photo paper and that printer has special settings to select the Canon photo stock. I also have the same small IP100 as you have but we have never put photo paper into it, just regular paper. It may be that the photo paper that you are using is not absorbing the ink properly. Prints should dry on photo paper in less than thirty seconds. I have a feeling that this is the result of the paper and not the ink - unless the cartridge included with the printer went bad. Try a black and white print on the same photo paper and see what happens. And also try a print on plain paper.

Does it dry if you don't use photo paper, but regular paper?

Sounds really strange that ink won't dry at all