To glue the paper from spreading the sheets perfectly vertical do not trust the references of a corner or a window but always draw a reference using the plumb line to maintain a perfect verticality.
When you get near a corner, proceed as follows:
Measure down, halfway and top the distance between the last sheet laid and the corner or corner
Take this measurement and add 2.5 / 3 cm. It will be the width of the cloth you need.
Glue it making sure that it adheres well with the brush p> li>
If the paper tends to wrinkle in the corner after the fold, make small horizontal cuts with a pair of scissors. p>
After the angle to avoid the ripples due to the imperfect orthogonality of horizontal cuts on the paper with a pair of scissors.
This will allow the card to extend itself and avoid ripples.