Im working on Arches100% cotton 185gsm watercolour paper, which is a bit lighter than Im used to, hence Im having to learn how to 'stretch' paper. Yep, like you do with canvas only different. Apparently it makes for ease of paint flow and stops buckling from washes.
Basically I got a 4 ply board and estapoled both sides and the edges to prepare it. Then you soak the watercolour paper in water for about ten minutes. Lifting it out you place it flat onto the prepared board, wiping off excess water. Then using special tape, which has a glue that activates when it gets wet, I taped the picture, with pencilwork side up, down to the board. Making sure to press out any bubbles or buckles. Ive just done this process with my first drawing, so apparently now i leave it to dry out on a flat surface, and then its time to add some colour to Mika's world. Exciting...