Painted cinder block

G

glabarta

New member
Hey guy`s,
I need to do the backside of a building. Painted cinder block. Paint has faded pretty good, so this will be a prep job for new paint. I`m guessing regular house wash mixture. Bleach, water and some Joy. Sound about right, or should I go w/ something else?
 
You could try some TSP too.

Here's a picture of one I did a couple years ago. I used a mixture similar to what you are talking about, and just blasted the paint off of it.
 

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for that kind of prep job i would use a very strong chem and a 40 deg tip to get speed.
For me-hd80 with hang time added.
This strong sod hyd mix will eat the top layer of paint,if not more.
It's all about speed.
 
I would use Xylene, apply straight, let sit for 5 minutes then light rinse. You may have a problem telling that the surface was ever painted.
 
for repainting sometimes the cust will want it just cleaned not removed.
If you remove it , it takes more paint to re-paint.
old paint keep's the new paint on top of the block.[old paint is the primer.]
 
leaving the paint residential jobs might be ok but on commercial jobs hospitals and the like the code might be different ...there is a report out that they say that old paint.....even with paint retarding paint over it is one of the major causes for fires to spread so fast...i am just trying to remember where i read the report......
 
One concern that I would have is does the paint contain lead.

If so collection would be needed. If it does not you home free!

Extreme- Is Xylene something that can be safely used and washed down without collection or cautions?
 
Extreme,
Xylene appears to be nasty stuff.

A respirator and gloves are recomended. Also associated with some types of cancer.

Does not seem like a chemical you just want to wash down without reclaim
 
I used it and it worked great. I did use a respirator, no gloves though, it evaporates quickly. as for reclaim, get a shop vac if you can't afford a big reclaim system. either way, it's up to you. just offering some advice.
p.s. DO NOT
 
Watch out, Xylene can quickly pass through your skin. Get an MSDS on it and read it carefully.

When in the Navy, we used it for cleaning the buss bars in electric distribution centers. We had to use full chemical suite with airline resporators(gas masks are no good with this stuff).
It did do a great job cleaning the equipment without leaving any residue behind.
 
Glabarta and others, Care should be taken to see if there is lead in the paint. Any local paint store should have an inexpensive lead test kit. Clean, Wash and rinse without removing any paint should be fine. Let the painter scrape and brush on the final prep. That way he is liable for paint chip cleanup. If you do have chips falling off and coming loose, sweep and vac them up for the customer. We did a job for the State of Texas like this , removed paint from some concrete walls. They guarantteed it nad no lead. They tested it and it did. We had to block all drains, sweep and vac all the runoff, put it in containers. Once we did that it was their responsibility to dispose of the paint chips of it properly.

I also have used Xelene. Nasty stuff. Its in most carb cleaners and gas additives.

Here is an unconventional tip:

When removing spraypaint grafitti form latex paint . Too much heat and pressure will remove the latex also. Paint stripper or deck stripper will take the latex also.
In one hand have can of carb cleaner. In the other hand have powerwasher with short wand and low pressure tip. Can use hot or cold water, But make sure to use LOW PRESSURE. High volumn is better .
Spray the Grafitti with the carb cleaner, immediately follow with water rinse. Reapply if necessary. Works great. Removes the grafitti and leaves the sub structure intact.
Now the enviromental safety of all this questional to say the least. But the amount of chemical to the amount of water is not even measurable.
This is totally unconventional , but it works. Now I have let the cat out of the bag .
If anyone asks, You didnt hear it from me. A friend of a friend told me , and they swear by it.
 
Michael T said:
Glabarta and others, Care should be taken to see if there is lead in the paint. Any local paint store should have an inexpensive lead test kit. Clean, Wash and rinse without removing any paint should be fine. Let the painter scrape and brush on the final prep. That way he is liable for paint chip cleanup. If you do have chips falling off and coming loose, sweep and vac them up for the customer. We did a job for the State of Texas like this , removed paint from some concrete walls. They guarantteed it nad no lead. They tested it and it did. We had to block all drains, sweep and vac all the runoff, put it in containers. Once we did that it was their responsibility to dispose of the paint chips of it properly.

I also have used Xelene. Nasty stuff. Its in most carb cleaners and gas additives.

Here is an unconventional tip:

When removing spraypaint grafitti form latex paint . Too much heat and pressure will remove the latex also. Paint stripper or deck stripper will take the latex also.
In one hand have can of carb cleaner. In the other hand have powerwasher with short wand and low pressure tip. Can use hot or cold water, But make sure to use LOW PRESSURE. High volumn is better .
Spray the Grafitti with the carb cleaner, immediately follow with water rinse. Reapply if necessary. Works great. Removes the grafitti and leaves the sub structure intact.
Now the enviromental safety of all this questional to say the least. But the amount of chemical to the amount of water is not even measurable.
This is totally unconventional , but it works. Now I have let the cat out of the bag .
If anyone asks, You didnt hear it from me. A friend of a friend told me , and they swear by it.
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Great Reply Mr President!! Uamcc
 
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