Draw marking lines on the wall and ceiling, according to the distance written deside of the designs of the crown molding and paste PVC profile provided with the crown molding as above.
Fix the PVC profile on the wall and ceiling using screws, nails or paste it using rubber adheshive, like the drawing below.
Now, just insert the sheet of cornice into the above channel and enjoy the look for the life time.
Setting, Joints and Corners :
Place the second sheet of crown molding or border beside the first sheet, if design do not match, cut the sheets and match the design.
Paste the same design smaller piece on the back of the two sheets (which you are going to joint) .
Insert the whole sheet into the channel of the PVC profile.
The crown molding and borders can be cut using a small teeth saw or scissors.
For corner installations, Use the corner moldings to avoid mis cuts and to speed up the installation.