Elemonator and Oxalic Acid?


#122

@CaCO3Girl Mary, how many Lipton full size tea bags and cups of sugar will dissolve into one gallon of water, and still allow for ice cubes?


#123

I can’t give my formulas away but ill say less than 5% phos…and it wouldn’t hurt to put your favorite surfactant in there at less than 2%


#124

Sorry, that’s food chemistry and my family (who are great cooks and even master chefs) are convinced the cooking gene morphed into the chemistry gene in me. I do NOT give advice on food things…it doesn’t go well :joy:


#125

Great Job Harold!

Question - did you only treat the rust spots or did you do the entire driveway?


#126

Thanks. I treated up until the expansion joints of the section that the rust was in. You could see a slight difference but I was out of OA and the customer was beyond happy.


#127

Your results are similar to what I see. A general “whitening” with some concentrations of extra white. Does anyone know how to blend this out and make it look more natural and even?

Do an acid wash after?


#128

That’s the only thing I would do different. I rolled the entire thing 3 times, then spot treated. I will not spot treat next time. I’ll either roll it more or accept the residual stain


#129

Nicely done. Youngster!


#130

Maybe I’m missing something but I don’t get all the confusion. After surface cleaning once (no hot water), I came back and pump sprayed OA, waited for rust stain to disappear (5mins), and rinsed.

I use liquid OA that comes in 5gal bucket without diluting. $50 and I charged $100 to remove.


#131

Drive by in two weeks and see if it’s back. Sadly, sometimes a shadow returns.


#132

I tell the customers it’s coming back, unless they turn off their irrigation system…lol


#133

Where do you get your OA from in liquid form?


#134

Local PW equipment store. It’s called White Ox.