You may want to give the glass on the inside another quick clean in case any dust has settled on it.
How to matting watercolor paper.
Alternatively you can mount your painting after it has been painted.
Use fingernail to press hanging tape to watercolor paper and mat board.
This will protect the paper itself.
You have to ways of mounting watercolor paper on board.
You can do it with your white paper let it dry and then paint afterwards this technique has the advantage of stretching your paper at the same time you are mounting it.
Fold the paper to mark where you ll be making your cut or tear.
Soak your paper before stretching the first step in stretching watercolor paper it is to soak each sheet in a tub of cold water.
Use an acid free sealant spray formulated for use with water colors and be aware that some of the older sprays tend to yellow your paints somewhat.
Soaking your paper in a tray of shallow water before you paint on it is a technique my art teacher taught me.
It beautifully displays the decorative deckled edge of watercolor paper.
After 24 hours of soaking take it off and place the paper on a plastic board and flatten it as much there.
For more matting ideas and advice check out this super helpful article with lots of pretty pictures the right mat for your artwork one of my favorite ways to frame a watercolor painting is with a float mount.
Protect the actual surface of your watercolor by spraying a protective sealant on the surface of your painting.
As you work with your paper after it s dried completely it wrinkles less.
The mat board with the attached watercolor painting can now be placed in the frame.
Fill the tub with just enough water to immerse the paper so it floats then let it soak 5 10 minutes making sure it is totally saturated.
Double the paper over on itself in the appropriate location making sure the edges are neatly aligned.
Then immediately use masking tape to keep it stretched out.