According to Marsh, soda blasting will remove almost all coatings, although several passes may be required for thicker or more durable high-performance coatings, such as epoxies and polyurethane. The most significant advantage is the ease with which coatings may be removed without causing harm to the concrete surface. Disadvantages include additional time and cost for removing the coating before further treatment can be done on the concrete.
Concrete can be made to look like stone by using a soda blasting process. The fine powder from the blasted material can then be painted onto the concrete to give it a finished look. Disadvantages include removal of some aggregate and possible damage to any painting that is applied afterwards. There is also increased risk of inhalation injury if not done properly.
Soda blasting was first used in the construction industry during the 1930s. Since then, it has become a popular method for removing paint from steel structures and has been widely used to prepare concrete surfaces for further painting or sealing. It is also used to clean up concrete that contains metal objects such as old nails or screws. The concrete must be cleaned before it is re-used because any residue from previous uses would make it difficult or impossible to color match with other areas of the structure.
There are two types of soda blasting: wet and dry.
A soda blaster employs granular sodium bicarbonate to remove tenacious paint off concrete and other surfaces fast and without hurting the substance beneath. Regular baking soda is ineffective. You can make your own powerful blasters by combining salt with acid to create a spray-dispersed powder, or detonator, as it's called in the trade.
Concrete requires a chemical reaction to break down the material you want removed. Baking soda alone will not do this. But if you mix it with an acid, such as vinegar, it creates carbon dioxide gas that does exactly that. The gas also helps disperse the powder so that it gets into small crevices and cracks where most metal paints don't go. The mixture is applied with a hose or sprayer, and once it has dried, heat is applied to burn off any remaining powder.
This method is very effective for removing old paint layers from concrete surfaces, but it won't work on new paint. For that, you need organic solvents such as vinegar or alcohol. They break down the resin in the paint molecule and allow the salts to dissolve the pigment molecules.
You can use soda blasts to remove paint from wood, as well. The only thing to be careful of is not to use too much soda because it will eat away at the wood fiber underneath.
Soda blasting is similar to glass bead blasting, except it utilizes baking soda or sodium bicarbonate, which is much softer on the surface. This works well on ceramic, pebble, and other pool tiles, as well as stone pool tiles. Because it has a pH of 8.3, it may raise the pH and alkalinity levels, particularly if you have a big swimming pool. You should check with your pool dealer or spa manufacturer about any effects this might have on your pool or spa.
You can soda blast pools after cleaning them with a pool cleaner and water treatment product such as chlorine or salt. Use a mild detergent during cleaning that does not contain phosphorus or other chemicals that could be removed by soda blasting.
When blasting, make sure to wear protective clothing including goggles and gloves. Also, keep children and pets away from the pool while it's being blasted.
The process is the same for soda blasting as it is for glass bead blasting: Mix the dry powder with air using an air compressor, sprayer, or fan. Then, shoot it at the target (in this case, the pool floor or side wall). The powder will explode into tiny pieces when shot at high speeds from an air gun or pellet gun.
This process can remove ground-in dirt, rust, and other contaminants from your pool floor or walls. It can also give your pool a new look by removing old color bands or stains from the floor or walls.
Acid etching eliminates laitance but does not remove curing chemicals or many of the impurities prevalent in industrial environments, such as greasy deposits or water-insoluble components, which can all interfere with coating adherence. Inadequate surface preparation can lead to a weak bond and a lack of coating adherence. If the concrete is heavily contaminated, it may be necessary to chemically clean the surface first.
If acid etching is not done, then over time the concrete will begin to lose its texture and look like plain old concrete again. The loss of detail will eventually become noticeable even under normal lighting conditions. Concrete that has not been etched will also take on the color of the surrounding material, usually some shade of brown or grey. This is called "color bleeding" and it's what will happen if you try to use painted markers to label old concrete pipes without first etching them.
Concrete that hasn't been properly prepared for painting will also require additional steps to ensure long-lasting results. Painters have a hard time adhering to dirty surfaces, so you'll need to thoroughly clean and prepare concrete before applying a primer/topcoat system.
Finally, keep in mind that concrete floors are porous materials that allow moisture to seep through, which can cause plaster walls to rot. It is important to provide adequate ventilation when working with concrete.
The best way to protect concrete floors from damage is by using a protective coating.