Before you can paint with water on paper, the paper must be prepared so that it continues to be even.

Measure the appropriate lengths of paper tape.

Use a damp cloth to gently moisten the paper by repeatedly running the cloth over it.

The paper is damp enough when all resistance is gone and it feels quite limp.

Moisten the glue on the paper tape.

Attach the moist paper with the moistened paper tape to a flat surface

Let the paper dry.