Ohh did I just hear you say you want your watercolors to work and look like acrylics??? Ok, we can do that too. You need a medium called "Acrylic Gloss varnish/medium"... (which comes in four finishes: High Gloss, Gloss, Satin, Matte) Mix a drop or two of the gloss varnish medium with your watercolors - wallah - acrylic paints. The gloss varnish medium is also great as a sealant on top of your artwork I use it a lot as a sealant on my cigar boxes. Or if you are into collage/decoupage, the gloss varnish medium is a great "adhesive and sealant" all in one. (use it like a glue) You can also use the gloss varnish medium to mix dry pigments into (pearl ex, powdered pearls and faerie dust) to create a paint. If you mix the powdered pigments with the gloss varnish medium, no need for either gum arabic or a spray sealant. The acrylic gloss varnish mediums (all of them are clear) are very inexpensive, very versatile and quite useful as an addition to your supplies. I use the Liquitex brand of the acrylic gloss varnish mediums, and I got mine at Michael's, but you could also get them from any art supply store or craft store that carries acrylic paints.

If you want a slightly shimmery/sparkly seal over something, try mixing a little ultra fine glitter into the gloss varnish medium prior to painting it over your surface. Georgeous.