Plastering corners is one of the hardest techniques to learn, it takes a lot of practice to perfect the 90 degree angle, commonly found in modern buildings, and it is even harder to achieve the technique for the unusual angles that can be found in bay windows and old buildings.
A twitcher is the tool of choice for most plasterers, although some old hands prefer to use other small trowels and a very steady hand, to get the same effect. Ask any plasterer the best way to plaster a corner and you will get many different responses, but the most common technique is to use a twitcher on the second pass; using one on the first coat can cause drags around the corner, that then need to be levelled out with the second coat, which can lead to a poor finish and lumps around the corner, drawing attention to what is supposed to be a perfectly smooth angle. For this reason many plasterers adapt their tools to suit their technique, cutting down the wings of the twitcher to reduce the drag lines that can be left in plaster that is still slightly too wet.
It is best to wait until the plaster is a little more set than usual to finish the corners; the firmer the product, the less damage you can cause with a corner trowel. If the plaster has gone slightly too firm you can sponge the surface to make it more workable, but it is best to get the timings to perfection and not have to backtrack or make amendments to plaster that has already gone off.
As with anything in life, practice makes perfect; so the more corners you work on, the better your technique will be. It is also worth picking up alternative techniques from other plasterers, as they may have a method that works better for you; some plasterers just don’t like corner trowels at all and if you don’t get on with them either, it might be better to try another way entirely than keep struggling with a technique you can’t master.
Using beading on external angles is a common method of ensuring a smooth angle, but some beads don’t make enough of a positive difference to be worthwhile, and ensuring that they are covered can lead to more problems than they are supposed to fix.
is a new corner tape that lays the foundation for a smooth corner, without being difficult to work with. The tape is flexible and can be used on any angles, so it is not only a replacement for 90 degree beading, but for all types of angled bead in one product. It is memory free, meaning it can be measured in place, creased and cut without spoiling the product. The polymer core leaves a smooth angle wherever it is used, and it makes short work of tricky angles, leaving you to concentrate on the whole job, rather than lose focus because you’re concentrating too hard on just getting the corner right.
The pre-formed hinge that runs down the centre of the tape makes sticking it down easy, as you can follow the crease into the corner. This is a great bonus for raked angles as it is hard to get this tape stuck in the wrong position, or have it sloping up or down at one end. If it needs to be replaced, it can be done very easily but it is very hardwearing, accommodating framing movement and resisting impact damage much better than other methods of corner finishing. If you really struggle with corners, try out EasyFlex Pro for a hassle-free corner plastering experience.