All you have to do is put the watercolor painting face down on the table, then spray water evenly on the back with a watering can, wet the drawing paper, don't spray water, spray it several times after the drawing paper absorbs water, then put the painting upside down on the drawing board and brush it with a thick paper strip (3 cm wide) prepared in advance. ! ! ! ! !
The disadvantage is that the picture will lose one centimeter on each side! ! ! ! !
Do as I say, and you will understand! ! ! !
If you have any questions, please contact again! ! ! !