If you coat over either new concrete or dirty concrete without first using a concrete grinder and diamond wheel or other methods you will only achieve partial adhesion of the sealer in small areas and the majority of the floor will suffer from peeling after a few months or a year.
Peeling is a layer of coating that has never adhered fully to the surface and as it dries and hardens it de-laminates away leaving a bubble of air underneath.
To clean concrete before sealing the surface needs to be free of any contaminants and be porous to allow the sealer to key into the concrete surface.
There are two main concerns with preparation of worn concrete- one is sheltered sections that still have a tight surface which will have to be opened and the second is oil that has soaked into the concrete.
Whilst oil will soak through concrete the good news is that you only have to remove it from just below the surface to achieve good adhesion. If there is a concentrated quantity of oil on the surface you will need to to extract most of it first with a solvent like turpentine and an absorbent such as kitty litter. Auto degreaser will do a satisfactory job as well.
Once the surface of the concrete is clean it will need to be opened with either shot blasting, acid etching or grinding.
At iCOAT we grind rather than use any other method, because it is the best method.
For all the right reasons we steer well clear of acid. For this- your body, your garden and the waste water system and environment thank us every day.
Shot blasting is a craft in itself and requires a professional in that field. Shot blasting can do more damage particularly in domestic situations. If the hardness of the concrete is inconsistent the shot may gouge out more than required creating an undulating effect which is costly to restore.
So, you can see that surface preparation is of paramount importance and critical to the finish as well as the adhesion of the coating.
iCOAT are experts when it comes to concrete floor coatings. A visit to our showroom to view the range and obtain the best advice is vital before you move forward.