Muriatic Acid

 
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Old 10-24-2007, 10:24 AM   #1
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Muriatic Acid


I need to take a sack finish off a foundation wall in order to apply cultured stone (canít get it to stick to the sack finish). Iím going to use muriatic acid; Iíve never used the stuff before. Do you just brush it on and how long do you have to wait before you can apply the stone?
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Old 10-24-2007, 01:30 PM   #2
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Re: Muriatic Acid


what is a sack finish?if the wall has been painted,you will not get stone to stick by using muriatic acid.you will need to use metal lath.

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Old 10-24-2007, 01:42 PM   #3
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Re: Muriatic Acid


Sack finish in our area is a sand mix that is rubbed on to a foundation to make it look finished (hides panel mark and tie marks). It looks like paint on sand finish but the color of cement. Iím not sure as to the mix or application. The way I get a sacked look is to apply thorite with a rubber float.
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Old 10-24-2007, 01:48 PM   #4
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Re: Muriatic Acid


If you do decide to use it make sure you use all protective equipment that stuff is nasty when it hits. It'll make you gag if your anywhere near it.
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Old 10-24-2007, 02:05 PM   #5
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Re: Muriatic Acid


Iíve got a good full face respirator and neoprene gloves.
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Old 10-24-2007, 03:11 PM   #6
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Re: Muriatic Acid


Quote:
Originally Posted by sidejobs View Post
I need to take a sack finish off a foundation wall in order to apply cultured stone (canít get it to stick to the sack finish). Iím going to use muriatic acid; Iíve never used the stuff before. Do you just brush it on and how long do you have to wait before you can apply the stone?
It sounds like you are talking about a thin parging. If it not painted then the stone will not stick. Do not use acid to remove you will need gallons and gallons and may damage the foundation. Acid is for removing stains only.
Try metal lath instead. Safer and easier.
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Old 10-24-2007, 03:45 PM   #7
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Re: Muriatic Acid


thanks I'll use lathe
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Old 10-24-2007, 03:56 PM   #8
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Re: Muriatic Acid


Wasnít aware what parging was with a quick look on line Iím fairly sure itís not parging.
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Old 10-24-2007, 08:58 PM   #9
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Re: Muriatic Acid


It must have an additional coating on it if it is any type of cementious parging material, be it Thoroseal, sand mix, or job mix. Adheered veneer will suck onto any of those products so fast and tight that you better do your adjustments quick.

If it won't stick, it may be your mix (probably too wet), or there may be a clear sealer or paint on it. A photo would help.
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Old 10-24-2007, 10:52 PM   #10
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Re: Muriatic Acid


I still donít know what was on there. Took muriatic acid and painted on a coat, it bubbled a little. After rinsing there was a coat that looked like Laminate glue that was real heavy and to the almost tacky state. If I work it real hard it would ball up. After another coat of muriatic acid it was still there, but after an hour with a grinder with a wire wheel it is now all gone. Iíll try to stick the stone tomorrow. Broke through the coating looked like sand and cement and about 3/16Ē thick. To late for pictures and probably would have been hard to see. Thank for the responses
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Old 10-24-2007, 11:38 PM   #11
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Re: Muriatic Acid


So it was coated with some unknown goo. If you got that off down to cementious coating, you should have no problems. The rule is 80% clean. That means in a 1 inch square area 80% is totally clean and in a 10 square foot area 80% is clean. 80% of any given area has to give good adhesion. That is worst case.
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Old 10-25-2007, 01:25 AM   #12
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Re: Muriatic Acid


Better to apply muriatic acid in solution with a hudson type pump up sprayer. Use eye and skin protection. nasty stuff!
Rinse well.

Goo must have been a latex bonding agent.
Probably could have went right over the "sack finish."
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Old 10-25-2007, 03:30 AM   #13
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Re: Muriatic Acid


Sounds like acrylic stucco base coat to me if it's got the goo, good luck trying to get that stuff off. The lathe over the top solution sounds easier to me.
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Old 10-25-2007, 04:20 AM   #14
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Re: Muriatic Acid


Don't know where you are working but muratic acid is very toxic to tree roots also( besides yourself) trust me,I found out the hard way
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Old 11-05-2007, 11:03 AM   #15
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Re: Muriatic Acid


I installed lath and a scratch coat of type N mortar and Iím still having problems. Iíve tried wet runny mortar, drier mortar, mortar additives, wetting the stones, wetting the
Scratch coat and on and on. Donít know whatís going on, the first 70 square feet went fine. So for the last 20 feet I called a local mason and for 300 bucks heíll finish the last 20 feet for us.

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