Dried Cement on Paint

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mcpp66

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My first post in a long, long time. Anyhow, I was detailing my girlfriend's 2012 Honda CR-V and I came across what looks like dried cement on her paint. I tried like hell to get it off but to no avail. First I started off with DP Cleanse-All (undiluted) and then used Tar-X because at first I had no idea what it was. I then even resorted to using a brillo pad to try to "scratch" it off but also no luck. The only thing that accomplished is that I had to buff around that area to remove the haze that I created. It also reinforced that sometimes you just have to let some things go. Lol. Anyhow, my last thought is to try to use a plastic razor but that thing is stuck on her paint so badly that I'm afraid that any other aggressive attempts to get it off will possibly remove paint. Are there any other types of cleaners or chemicals that I can use to try to get it off? Again, I'm not sure this is dried cement, but it sure looks like it. Thanks.
 
I had this happen to my Super Duty. I tried everything to get it off, even tried sanding it off. Finally, I found good old fashioned white sugar and water will dissolve the cement where vinegar and stronger acids wouldn't touch it. Unbelievable, I know.
 
White sugar and water...really? Wow, never heard that one before. How much sugar and water did you mix? How did you apply it? Did you let it soak? How long till it dissolved?
 
Here's another option for dried-on (cured) cement:




Bob
 
I just used the sugar trick today. I asked about cement about a week ago. I've used it several times the past week, it works amazingly! I used 4 pounds sugar and just slowly added water to it was a nice thick paste and really well dissolved.

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Since what I showed in the picture is all there is I guess I wouldn't need to use 4 pounds necessarily, but rather just mix enough sugar and water to form a paste, correct? I then assume that I just put the sugar-paste solution onto the cement and let it sit? How long did it take?
 
I assume this is safe on the paint?
 
If it's not dissolved enough and you rub it real good id imagine the sugar granules could mar the paint slightly, or the dissolved cement could mar. But it's not gonna eat the paint. Same thing with the bought stuff, very safe. So far every time I've used it, I've followed up with claying and an aio anyway

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I let it sit for about five minutes. No you wouldn't need 4 pounds. Don't let sugar dry on you though. Keep it wet

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I can't recall how much I used, but it was in a sprayer bottle. A paste would work too, just let it sit for awhile to dissolve the cement.
 
Lol I would never think sugar could remove cement. Please post pics after u give the sugar a try. I'm very interested in this.

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I'll get to it in a couple of weeks but I will post when done. I thought the same thing myself when I first read the sugar-water trick. Lol.
 
This thread apparently is not only a lesson on how to remove dried cement from your paint, but a lesson on how to handle groceries in the garage on a rainy day...
 
mcpp66 said:
I'll get to it in a couple of weeks but I will post when done. I thought the same thing myself when I first read the sugar-water trick. Lol.
Click to expand...


Subscribed


I'll be interested to hear if this works....


For those reading this into the future, like Bob mentioned, Back-Set is a product made just for this type of problem.

One of my students, been through my Detailing Boot Camp Class posted this thread with his experience and before and after pictures.

How To Remove Concrete Overspray off car paint



:)
 
I work for a company which does a lot of concrete testing on construction projects and also in the laboratory to determine the compressive strength of concrete samples. It is known in the concrete industry that adding sugar to a concrete mix can retard the hardening process (or hydration process) of concrete. In other words, by adding sugar to a mix of concrete, the concrete will take longer to harden or set.
 
Im almost tempted to splatter some concrete on my truck and test this sugar method out my self. Im too impatient and want to know now lol
 
Although I agree that sugar can screw up a batch of concrete faster than anything (one of my good friend is the largest concrete contractor in South Louisiana), I strongly suspect that the effect Frank described would apply mostly to the "uncured" concrete, rather than the set and cured product.

I live in sugarcane country and have had sugar in all form (from raw to refined) on the concrete of my shop, mixed with all kinds of chemicals (acidic and alkaline) and I haven't seen any dissolving of my concrete. I am not saying it does not have any effects, but would question the chemistry a little. Acetic acid (vinegar) does had a pH of 2.4, so who knows!?!?

Subscribing to see if we have found the million dollar idea.... or the next best salad dressing (since those two are the primary ingredients)
 
FrankS said:
I work for a company which does a lot of concrete testing on construction projects and also in the laboratory to determine the compressive strength of concrete samples. It is known in the concrete industry that adding sugar to a concrete mix can retard the hardening process (or hydration process) of concrete. In other words, by adding sugar to a mix of concrete, the concrete will take longer to harden or set.
Click to expand...
When cements, including any of their admixtures, cure/dry/set-up...Do they not become concrete?

With that in mind:
I can see where: Sugar(s)...will retard cements' setting-up processes...even, IMO: sometimes indefinitely. (Probably by preventing the formation of some silicate hydrate of calcium or another.)


So...It would be interesting to know:
How sugar(s) would work to reverse those processes of what it takes to have a:
Now already, has been set-up/"dried"/cured concrete.


Bob
 
Setec Astronomy said:
...cement is merely an ingredient in concrete.
Click to expand...

This is true. There is a difference between concrete and cement. Concrete normally consist of cement, coarse aggregates (or rocks), fine aggregates (or sand) and water. Cement is like the glue that holds them all together.

I was referring that sugar can be a retardant to "wet" or unhardened concrete though.
 
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