How to Remove Paint from Concrete

Paint removal from a concrete surface is undoubtedly a challenging task. It is slightly easier if the paint stains are still fresh. In such cases, you can try to clean up water based paint by soaking it in water for some time and then scrub it with harsh detergent and a hard bristled brush. If it is an oil based paint, then you can apply solvents like turpentine or acetone on it to dissolve out the paint. However, removing dried paint from concrete requires a lot of efforts and is time-consuming too as the paint has already entered into the porous surface of the concrete. Therefore, you have to use special techniques to pull out the paint accumulated in those pores.

How to Clean Paint Off Concrete Surface

In this section, we are going to discuss different ways of removing dried paint from concrete surface. While implementing any of them, you should be patient as you may have to repeat them a number of times before you can get rid of the paint completely. A few important methods that will help you in the task are discussed below:

Method #1: Use Paint Strippers
The most popular technique to remove paint from concrete involves use of chemical strippers. You can use them on all types of paints including the water resistant ones. A number of variety of stripping agents can be found in the market. Soy-based strippers are considered as safe as they are non toxic and are easy to use. They are found in the form of gel. Apply the gel on the paint and allow it to settle for a while on it. This will loosen up the tough, dry paint to some extent. Then, take a thick plastic scraper and strip off the gel along with the paint from the concrete surface.

If the paint coat is thick, it will require more than one application. The best part of chemical stripper is that you can reuse the same gel strip again and again on the stain. Once the maximum amount of paint is out of the concrete, rub the spot with a nylon brush after pouring some scouring powder and water to scrub out the soft paint residues. Finally, rinse the area thoroughly with plain water and you can get back paint free concrete surface.

Avoid using chemical strippers that are toxic in nature. They show quick action but are harmful for the eyes, skin and cause environmental pollution. If you wish to use them on some stubborn paint stains, take all possible precautionary measures. The area where it will be used, should have proper ventilation and any furnaces or boilers or pilot light kept in the region should be turned off.

Method #2: Use Shot Blaster
Shot blasting equipment can be used to get rid of stubborn paint from concrete quite effectively. This is a highly expensive machine and you can get it on rent from the local home improvement stores. Its working principle is quite similar to that of sandblaster. The only difference is that it throws out tiny metal beads instead of sand. The abrasive material forced out under high pressure on the affected spot of concrete surface helps in paint removal. It has a vacuum attachment which then cleans up the released beads, dusts and paint debris by suction. The machine should be moved on the concrete carefully at such a pace that it does not strip off any concrete. Shot blasting often cause extensive damage to the surface of the concrete. Therefore, it should be used only in those cases where the paint stains are really bad. It is not recommended for concrete that are already cracked or chipped as its damaging effect can be so bad that you have to go for immediate concrete repair.

Other Methods
Pressure washing is also good where high power water pressure is used for cleaning up paint from concrete. It works well on almost all types of paints, except some strong ones like epoxy paint. However, this cleaning technique is applicable only for outdoor surfaces. Another method that can be used to take out ugly paint marks from concrete on outdoor surfaces involves use of floor grinders with diamond wheels. It should be used only if you plan to have a topping of cement because the grinder often leaves behind scrapes on the concrete.

These are some of the best possible options of concrete paint removal available with you. You have to select the one that suits your needs. If required, you can use more than one technique on the same concrete stain for effective results. While carrying out the task of removing paint, you must protect yourself with appropriate protective gear like glasses, respiratory mask and gloves.