pressure washer sandblaster image
Rodney G
I am trying to determine the best method to remove crumbling paint and remnants of what appears to be plaster on the interior basement walls of a house. The house was built in the mid 40's. The walls are cinderblock underneath what appears to be a skimcoat of plaster(?) and textured paint. I assume that the skimcoat was put on to fill in the grout lines for aesthetic reasons. Is anyone familiar with this practice? Should a power washer or sandblaster be used to remove this layer? Some other method? Any help much appreciated!
Answer
I have seen this stuff in other basements, and it never seems to stick. I think basements are a little too damp for this application. If it is crumbling, you may try to take it off with a putty knife. This is going to be very time consuming. I would next try the pressure washer, angling the stream under the edge of the plaster to see if you can blow it off.
I am hesitant to advise you to try a sand blaster. While I know it would take off the over coat, it is really going to be dusty and dirty. If you can stand the mess, go with this method.
I have seen this stuff in other basements, and it never seems to stick. I think basements are a little too damp for this application. If it is crumbling, you may try to take it off with a putty knife. This is going to be very time consuming. I would next try the pressure washer, angling the stream under the edge of the plaster to see if you can blow it off.
I am hesitant to advise you to try a sand blaster. While I know it would take off the over coat, it is really going to be dusty and dirty. If you can stand the mess, go with this method.
how do I get gloss paint off concrete slabs?
Ash
I accidentally got some gloss paint on some concrete slabs it has fully dried and will not come off!
I have tried using turps, isopropanol alcohol, sand-paper and a jet-wash, nothing works!!!
Do you know any ways of getting it off?
please!
Answer
How to remove paint from concrete?
There are a few ways to remove paint from concrete. We all know what a time consuming headache removing paint can be. But this must be done before applying any new coating, topping, stain, sealers, etc.
Pressure washing with a high power pressure washer works for most paints with exception to some of the stronger paints such as epoxies. Of course, this method is only recommended on exterior surfaces.
Shotblasting will strip concrete of most coatings as well as the surface of the concrete itself. If you don't want to alter or damage the concrete surface then don't use a shotblaster. This machine is like a sandblaster, but shoots tiny metal beads which can easily be recollected as you go. A vacuum is attached to the machine to suck up the dust and debris. A shotblaster will also create a nice profile for any future coatings or toppings. But you must be careful and move along at a steady pace or you will strip too much of the concrete itself. The problem is these machines are hard to find and expensive to rent.
Floor grinders with diamond wheels are another option. Unless you plan to overlay the concrete with a cementitious topping, I don't recommend this because a grinder will leave scars. It can also be too dusty for indoor use.
Chemical strippers are the most common method. There are many types of stripping agents. Knowing what type of paint and even the brand will help to decide which chemicals to use. You can contact the manufacturer for recommendations. The problem with most chemical strippers is toxicity. They can be very dangerous without good ventilation and harmful to the environment. Take all precautions including respirators, covering all your skin and eyes, and even turning off furnaces, boilers, and pilot lights.
There are some new, soy based products, that will remove paint from concrete or any surface. These strippers are low odor, environmentally safe, and easy to use. They come in a gel form. Just spread the gel on, let it sit for while, and the paint will easily scrape right up. The key is to be patient and let the gel do the work, not you.
We've only been able to find the soy based products at contractor supply stores and online. They really do work and are completely safe. They say you can eat the stuff and it won't hurt you, but I think I'll pass. The nice thing about the gel is, when you scrape it up, you can move over to the next area and spread it again. You can do this two or three times unless there are multiple coats of paint to remove. So you don't have buy enough to cover the entire surface, just reuse it as you go
How to remove paint from concrete?
There are a few ways to remove paint from concrete. We all know what a time consuming headache removing paint can be. But this must be done before applying any new coating, topping, stain, sealers, etc.
Pressure washing with a high power pressure washer works for most paints with exception to some of the stronger paints such as epoxies. Of course, this method is only recommended on exterior surfaces.
Shotblasting will strip concrete of most coatings as well as the surface of the concrete itself. If you don't want to alter or damage the concrete surface then don't use a shotblaster. This machine is like a sandblaster, but shoots tiny metal beads which can easily be recollected as you go. A vacuum is attached to the machine to suck up the dust and debris. A shotblaster will also create a nice profile for any future coatings or toppings. But you must be careful and move along at a steady pace or you will strip too much of the concrete itself. The problem is these machines are hard to find and expensive to rent.
Floor grinders with diamond wheels are another option. Unless you plan to overlay the concrete with a cementitious topping, I don't recommend this because a grinder will leave scars. It can also be too dusty for indoor use.
Chemical strippers are the most common method. There are many types of stripping agents. Knowing what type of paint and even the brand will help to decide which chemicals to use. You can contact the manufacturer for recommendations. The problem with most chemical strippers is toxicity. They can be very dangerous without good ventilation and harmful to the environment. Take all precautions including respirators, covering all your skin and eyes, and even turning off furnaces, boilers, and pilot lights.
There are some new, soy based products, that will remove paint from concrete or any surface. These strippers are low odor, environmentally safe, and easy to use. They come in a gel form. Just spread the gel on, let it sit for while, and the paint will easily scrape right up. The key is to be patient and let the gel do the work, not you.
We've only been able to find the soy based products at contractor supply stores and online. They really do work and are completely safe. They say you can eat the stuff and it won't hurt you, but I think I'll pass. The nice thing about the gel is, when you scrape it up, you can move over to the next area and spread it again. You can do this two or three times unless there are multiple coats of paint to remove. So you don't have buy enough to cover the entire surface, just reuse it as you go
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