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Once you have installed two drywalls meeting at right angles to each other, you are going to need to finish the join where they meet at the ceiling, using flexible correctly mitred cornice lengths. Cornice (or coving) of course comes in many shapes and sizes and is even available in easy-to-use light-weight polystyrene these days. This attention to detail will not only finish off the job nicely, it covers up ugly gaps and imperfections too. 
What You’ll Need
- Sandpaper
- Jointing compound to bond the cornice
- Putty knife
- Cleaning cloth
- Suitable lengths of cornice with correct mitre angle
Although not a difficult job, we are of course assuming that your drywalls are in place and that it’s just a matter of adding the ceiling trim to hide the gaps and join-lines.
Been There, Done That!
Fred is one of our long-standing London plasterers, and he always cringes when he receives an enquiry to quote on a plastering job that’s a botch up. While Fred appreciates that there are a number of very able-bodied DIY-types around, he also knows that finishing the gaps where wall meets ceiling is a skill that takes time to master.
Finishing First
You’ll need to smooth any rough edges on the drywall sheets by sanding them finely. Then, wipe the area with a damp cloth to remove the dust and dirt. Allow the surfaces to dry thoroughly.
Time to Glue 
Read the instructions on the bonding agent carefully and then apply as required to the inward-face of the cornice. Remember to run the glue right across the corner – that’s where the two cornice lengths will interlock neatly.
Mounting the Cornice
After observing any recommended waiting time for the bonding agent to dry, mount the cornice in position and press down gently across the full length. Wipe off any surplus glue. Once the glue has dried, you can fine-sand the surface prior to painting.
Call in the Experts
Here at Mr-Skill we fully understand that not everybody is DIY-minded, and may very well need professional help with such jobs. No problem at all, because that is the name of our game. So, rather find a plasterer with minimum fuss, and the good news is that we have some eye-catching specials running right at this moment too. You could even get as much as 30% off, but hurry!