Step 1: STEP 1 - Before You Start
Preparing the wall before you start is essential. First of all you need to make sure it's clean and secured with masking tape, after that you can start doing the measurements. It's good to know how would you like to divide your wall before you put the grid on. I've decided to divide mine into nine equal pieces. I simply left some marks on the masking tape, so it was really easy to connect them when I needed. Having all of these done I applied some primer using a paintbrush and waited the next 12 hrs for it to dry.
Step 2: STEP 2 - Application
Depending on what type of concrete mixture are you using always follow the instruction given by the producer! I had to mix mine first and then I started the application using finishing trowel and stripping knife (this one was only used to put some mixture on a trowel, but you can use any other tool that will be handy for you). The whole process itself is very easy, but you need to be quick if you've got bigger surface to cover, because concrete dries out fast. So remember to allow yourself extra time for smoothing before it gets completely dry.You need to apply only a thin layer of mixture at the time (no bigger than 1-2 mm!). To get the real concrete effect you've got to stick the trowel in and out to the wet surface. Then let it dry for about 30 minutes.
Step 3: STEP 3 - Smoothing
Now when the whole wall is covered with concrete you can start smoothing it. Use the same finishing trowel to do that, but this time try to smooth the surface instead of making it rough. Don't worry if the mixture gets a little bit too dry, you can always spray it with some water, but remember not to leave it for too long. When it gets completely dry you won't be able to do anything!
Step 4: STEP 4 - Finishing
Now when the wall is almost done, but not completely dry yet you can draw the lines that you have marked at the very beginning. The best way to do that is to use a long spirit level and a spanner end. It's good if you can ask someone for help in here, if not just try to be very patient and precise. Once you make a mistake at this stage it can't be reversible! After all of these is done don't forget to add characteristic concrete panel circles. To do that use a paint roller with round end. Simply put it to the wall in the right place, turn around and here we go it's all done!
Step 5: STEP 5 - Drying
In the end let it dry for at least 24hrs and you may start enjoying your concrete wall.