Bob Harrison asked about using muriatic acid on concrete floors prior to
painting.

AFAIK, muriatic acid is a weak form of sulfuric acid, which makes it
relatively safe for amateurs to use.  But 'relatively' is key.  It is still
highly corrosive and will burn skin and I don't even want to think about it
getting into eyes.

I've used it numerous times without difficulty.  I have vinyl, full length,
aprons.  I have not used a respirator or mask...but one should probably do
so.  I have had 50% solution get on my hands, and it is hot!  But when
quickly rinsed with water there was no blistering.

For cement, I used it highly diluted.  Perhaps a 5% solution.  Let sit for
15-30 minutes, then rinse thoroughly.  Paint as soon as feasible after
rinse.

Hope this helps,

Lloyd

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