Here is a new square set opening. Framed with external angles, 2 x base coats and 1 x top coat. You MUST scratch/scrape plaster down between each coat, usually just before it fully sets.
There’s the square set opening in the background with the external angles on before it’s trowelled. Remember to use a level and builders square when installing or they can look really bad when painted 🙂
Phillip Cordwell – http://ptcplastering.business.site