A laser printer uses dry toner that is "set" to the paper with heat - so it won't run when it gets wet.
It probably didn't work well with watercolor paper because that paper is thick enough that the fuser didn't get hot enough to set the toner. I used to have one at work that printed fine on 80 lb cardstock, but if I tried anything heavier the toner brushed right off.
If you want to use watercolors with an inkjet image, you just need to print it out and then lightly spray it with Krylon Workable Fixatif. It will set the black outlines but not resist the watercolor.
__________________ ~~Cheryl, with a "C"
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