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Confused regarding muriatic or phosphoric acid

P-WOG

Member
Joined
Jul 17, 2007
Messages
11
Location
Central Ohio, rural
Despite a thorough search I am now confused about the use of muriatic or phosphoric acid for prepping my 42 X 60 metal walled shop with power-troweled floor. I am sure this has been beat to death here. I did my 25 X 25 garage floor last year with muriatic and used Amorseal 1000 solvent epoxy coating and it came out great.
The shop floor is inside a pole barn metal building and would likely be harder to rinse thoroughly plus be harder to vent while etching. I use a respirator. Plus, I now wonder about the residual amount of muriatic remaining and impact on my tools or metal building.

I had planned to use diluted muratic acid, scrub, rinse and let dry before epoxy. After searching I am not so sure if that is the right path. Maybe I should scrub the few grease spots with muriatic and use phophoric on the whole floor? I could also just use a degreasing area on the areas with no grease spots. The floor is 8 years old and only oily in a few places. I don't want to grind or shot blast it. I am now thinking to maybe just use a chemical degreaser and call it good. It's basically a shop for auto and farm equipment.
Could someone familiar with this steer me in a better direction than I am now going? Thanks and :beer:
 
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benjamming

Well-known member
Joined
Jun 29, 2009
Messages
899
Location
Alabama
Acid is not a degreaser, so you will need to use at least a good degreaser for those areas.
Which epoxy product are you using this time?
 
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P-WOG

Member
Joined
Jul 17, 2007
Messages
11
Location
Central Ohio, rural
Acid is not a degreaser, so you will need to use at least a good degreaser for those areas.
Which epoxy product are you using this time?

I am going to use the same Armorseal 1000 two-part epoxy. First coat is thinned, second full strength.
My question is confusion regarding if I can get away with just an aggressive degreasing or if I have to use an acid etch. And if I have to etch, I don't think I want to use muriatic acid because it's a metal building. It will be hard for me to thoroughly rinse this floor out.
But I am not sure because I am not familiar with these things. That's why I need help on this.
 
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