A: You'll definitely want to use a water-based product for your first layer of color - oil and alcohol based mediums will not work. It will need to be a medium that will still react and lift with water once dry, so your best strategy will be making some swatches to test that property. Best results will be with reactive dye inks, which are formulated to lift and react with water. Some watercolor paints will lift, and others are formulated to stain and will not lift as readily. Craft and acrylic paints are water based, but probably won't lift after they've dried. Paper choice will make a difference too - some papers will readily absorb the ink, and others will allow it to sit on the surface.

A: You can stamp on them! I have had the best results with Versafine and Versafine Clair inks. The ink does need to be heat set - this will take a little time, taking care to not overheat or bubble up the paint. You'll know the ink is set when it shifts to a matte finish. I have noticed that the ink does act differently over certain brands of paint - I have the best results with fluid acrylics and the Apple Barrel brand craft paints. Others will work but the ink needs to be set quickly to prevent feathering. I hope that helps!

A: You'll want to be sure that your watercolor paper will feed through the printer - I would recommend a 90# weight if you're not sure of your printer's capabilities with heavier papers. The type of ink is another thing to consider. Some photo-friendly printers use pigment ink, which will resist bleeding when water is applied. If your printer uses dye-based ink, you can try heat setting, letting the ink cure overnight, or applying a workable fixative before painting. Here are some threads in our forum with more tips and tricks:
Digital Stamping > Watercolor Paper?
Printing on Watercolor Paper

A: Distress inks are dye-based inks that are formulated to dry slowly for blending and other techniques. They also will hold their original color when blended out with water, but true to their goal of a distressed look they will dry with a slightly mottled texture. They will lift, feather, and spot more easily with the application of water. Regular dye inks soak into paper and dry more quickly, so while they will react with water, the effect is usually less dramatic. Some dye inks will also break down into their component colors when combined with water. We have a tutorial on watercoloring with dye-based inks HERE! While dye and Distress inks are transparent, pigment-based watercolor crayons are more creamy and opaque, and contain a binder (usually wax) to hold their pigments together in a molded shape. You can use a watercolor crayon to color directly onto your project before blending out with water, or lift pigment from the crayon with a wet brush.